diff --git a/CHANGELOG.md b/CHANGELOG.md
index 864516dd5a..9f3ed4e701 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Moved the `rtl` and `renderer` props from the `theme` prop object to the `Provider`'s props API @mnajdova ([#1377](https://github.com/stardust-ui/react/pull/1377))
 
 ### Features
+- Define types for accessibility behaviors props. Do not render `aria-disabled` if the value is `false` @sophieH29 ([#1481](https://github.com/stardust-ui/react/pull/1481))
 - Add `Toolbar` component @miroslavstastny ([#1408](https://github.com/stardust-ui/react/pull/1408))
 - Add `disableAnimations` boolean prop on the `Provider` @mnajdova ([#1377](https://github.com/stardust-ui/react/pull/1377))
 - Add expand/collapse and navigation with `ArrowUp` and `ArrowDown` to `Tree` @silviuavram ([#1457](https://github.com/stardust-ui/react/pull/1457))
diff --git a/packages/react/src/lib/accessibility/Behaviors/Accordion/accordionBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Accordion/accordionBehavior.ts
index eb58f4754e..2053ff8cfc 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Accordion/accordionBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Accordion/accordionBehavior.ts
@@ -9,7 +9,7 @@ import * as keyboardKey from 'keyboard-key'
  * Triggers 'moveFirst' action with 'Home' on 'root'.
  * Triggers 'moveLast' action with 'End' on 'root'.
  */
-const accordionBehavior: Accessibility = (props: any) => ({
+const accordionBehavior: Accessibility = () => ({
   attributes: {
     root: {
       role: 'presentation',
diff --git a/packages/react/src/lib/accessibility/Behaviors/Accordion/accordionContentBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Accordion/accordionContentBehavior.ts
index 444120d274..a167d76f01 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Accordion/accordionContentBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Accordion/accordionContentBehavior.ts
@@ -7,7 +7,7 @@ import { Accessibility } from '../../types'
  * @specification
  * Adds attribute 'aria-labelledby' based on the property 'accordionTitleId' to 'root' component's part.
  */
-const accordionContentBehavior: Accessibility = (props: any) => {
+const accordionContentBehavior: Accessibility<AccordionContentBehaviorProps> = props => {
   return {
     attributes: {
       root: {
@@ -18,3 +18,8 @@ const accordionContentBehavior: Accessibility = (props: any) => {
 }
 
 export default accordionContentBehavior
+
+type AccordionContentBehaviorProps = {
+  /** id of the accordion title element. */
+  accordionTitleId?: string
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/Accordion/accordionTitleBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Accordion/accordionTitleBehavior.ts
index 7e475f024b..4234bda98c 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Accordion/accordionTitleBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Accordion/accordionTitleBehavior.ts
@@ -14,7 +14,7 @@ import * as keyboardKey from 'keyboard-key'
  * Adds attribute 'aria-controls=content-id' based on the property 'accordionContentId' to 'content' component's part.
  * Triggers 'performClick' action with 'Enter' or 'Spacebar' on 'content'.
  */
-const accordionTitleBehavior: Accessibility = (props: any) => {
+const accordionTitleBehavior: Accessibility<AccordionTitleBehaviorProps> = props => {
   const isHeading = /(h\d{1})$/.test(props.as)
   return {
     attributes: {
@@ -41,3 +41,14 @@ const accordionTitleBehavior: Accessibility = (props: any) => {
 }
 
 export default accordionTitleBehavior
+
+type AccordionTitleBehaviorProps = {
+  /** Element type. */
+  as: string
+  /** Whether or not the title is in the open state. */
+  active?: boolean
+  /** If at least one panel needs to stay active and this title does not correspond to the last active one. */
+  canBeCollapsed?: boolean
+  /** Id of the content it owns. */
+  accordionContentId?: string
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/Alert/alertBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Alert/alertBehavior.ts
index bf89d810de..b779fc733f 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Alert/alertBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Alert/alertBehavior.ts
@@ -7,7 +7,14 @@ import defaultBehavior from '../defaultBehavior'
  * Uses 'alertWarningBehavior` for 'danger' and 'warning' variants.
  * Uses 'defaultBehavior` for 'success' and 'info' variants.
  */
-const alertBehavior: Accessibility = (props: any) =>
+const alertBehavior: Accessibility<AlertBehaviorProps> = props =>
   props.warning || props.danger ? alertWarningBehavior(props) : defaultBehavior(props)
 
 export default alertBehavior
+
+type AlertBehaviorProps = {
+  /** An alert may be formatted to display a danger message. */
+  danger?: boolean
+  /** An alert may be formatted to display a warning message. */
+  warning?: boolean
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/Alert/alertWarningBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Alert/alertWarningBehavior.ts
index d94bde34b2..671ced9374 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Alert/alertWarningBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Alert/alertWarningBehavior.ts
@@ -6,7 +6,7 @@ import { Accessibility } from '../../types'
  * Adds attribute 'aria-live=polite' to 'content' component's part.
  */
 
-const alertWarningBehavior: Accessibility = (props: any) => ({
+const alertWarningBehavior: Accessibility = () => ({
   attributes: {
     content: {
       role: 'alert',
diff --git a/packages/react/src/lib/accessibility/Behaviors/Attachment/attachmentBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Attachment/attachmentBehavior.ts
index 2ced391759..7c83d78609 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Attachment/attachmentBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Attachment/attachmentBehavior.ts
@@ -7,7 +7,7 @@ import { IS_FOCUSABLE_ATTRIBUTE } from '../../FocusZone/focusUtilities'
  * Adds attribute 'tabIndex=0' to 'root' component's part.
  * Triggers 'performClick' action with 'Enter' or 'Spacebar' on 'root'.
  */
-const attachmentBehavior: Accessibility = (props: any) => ({
+const attachmentBehavior: Accessibility = () => ({
   attributes: {
     root: {
       tabIndex: 0,
diff --git a/packages/react/src/lib/accessibility/Behaviors/Button/buttonBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Button/buttonBehavior.ts
index e2f65517b8..0bc0d3c012 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Button/buttonBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Button/buttonBehavior.ts
@@ -1,21 +1,24 @@
 import { Accessibility } from '../../types'
-import * as _ from 'lodash'
 
 /**
  * @specification
  * Adds role='button' if element type is other than 'button'. This allows screen readers to handle the component as a button.
  * Adds attribute 'aria-disabled=true' based on the property 'disabled'. This can be overriden by providing 'aria-disabled' property directly to the component.
  */
-
-const buttonBehavior: Accessibility = (props: any) => ({
+const buttonBehavior: Accessibility<ButtonBehaviorProps> = props => ({
   attributes: {
     root: {
       role: props.as === 'button' ? undefined : 'button',
-      'aria-disabled': !_.isNil(props['aria-disabled'])
-        ? props['aria-disabled']
-        : !!props['disabled'],
+      'aria-disabled': props.disabled,
     },
   },
 })
 
 export default buttonBehavior
+
+export type ButtonBehaviorProps = {
+  /** Element type. */
+  as: string
+  /** A button can show it is currently unable to be interacted with. */
+  disabled?: boolean
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/Button/toggleButtonBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Button/toggleButtonBehavior.ts
index 2b1caf8311..da4d296b11 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Button/toggleButtonBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Button/toggleButtonBehavior.ts
@@ -1,5 +1,5 @@
 import { Accessibility } from '../../types'
-import * as _ from 'lodash'
+import { ButtonBehaviorProps } from './buttonBehavior'
 
 /**
  * @specification
@@ -7,17 +7,19 @@ import * as _ from 'lodash'
  * Adds attribute 'aria-pressed=true' based on the property 'active'. This can be overriden by providing 'aria-presssed' property directly to the component.
  * Adds attribute 'aria-disabled=true' based on the property 'disabled'. This can be overriden by providing 'aria-disabled' property directly to the component.
  */
-
-const toggleButtonBehavior: Accessibility = (props: any) => ({
+const toggleButtonBehavior: Accessibility<ToggleButtonBehaviorProps> = props => ({
   attributes: {
     root: {
       role: props.as === 'button' ? undefined : 'button',
-      'aria-disabled': !_.isNil(props['aria-disabled'])
-        ? props['aria-disabled']
-        : !!props['disabled'],
-      'aria-pressed': !_.isNil(props['aria-presssed']) ? props['aria-presssed'] : !!props['active'],
+      'aria-disabled': props.disabled,
+      'aria-pressed': !!props.active,
     },
   },
 })
 
 export default toggleButtonBehavior
+
+type ToggleButtonBehaviorProps = ButtonBehaviorProps & {
+  /** Indicates if a button is in pressed state. */
+  active: boolean
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/Chat/chatBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Chat/chatBehavior.ts
index 14720ab253..75d290ccdb 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Chat/chatBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Chat/chatBehavior.ts
@@ -16,7 +16,7 @@ const CHAT_FOCUSZONE_ATTRIBUTE = 'chat-focuszone'
  * Focused active element of the component is reset when TAB from the component.
  * Focus can be moved inside a child component with embeded inner FocusZone by pressing a specified key.
  */
-const ChatBehavior: Accessibility = (props: any) => ({
+const ChatBehavior: Accessibility = () => ({
   attributes: {
     root: {},
   },
diff --git a/packages/react/src/lib/accessibility/Behaviors/Chat/chatMessageBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Chat/chatMessageBehavior.ts
index 8644180a6b..7e4e958978 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Chat/chatMessageBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Chat/chatMessageBehavior.ts
@@ -15,7 +15,7 @@ import { FocusZoneTabbableElements, FocusZoneDirection } from '../../FocusZone'
  * Keyboard navigation is circular.
  * Focus is moved within the focusable children of the component using TAB key.
  */
-const chatMessageBehavior: Accessibility = (props: any) => ({
+const chatMessageBehavior: Accessibility = () => ({
   attributes: {
     root: {
       [IS_FOCUSABLE_ATTRIBUTE]: true,
diff --git a/packages/react/src/lib/accessibility/Behaviors/Checkbox/checkboxBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Checkbox/checkboxBehavior.ts
index f3c2c7f1db..cf3abbf571 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Checkbox/checkboxBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Checkbox/checkboxBehavior.ts
@@ -1,11 +1,6 @@
 import * as keyboardKey from 'keyboard-key'
 import { Accessibility } from '../../types'
 
-type CheckboxBehaviorProps = {
-  checked: boolean
-  disabled?: boolean
-}
-
 /**
  * @specification
  * Adds role='checkbox'. This allows screen readers to handle the component as a checkbox button.
@@ -16,7 +11,7 @@ type CheckboxBehaviorProps = {
 const checkboxBehavior: Accessibility<CheckboxBehaviorProps> = props => ({
   attributes: {
     root: {
-      'aria-checked': props.checked,
+      'aria-checked': !!props.checked,
       'aria-disabled': props.disabled,
       role: 'checkbox',
       tabIndex: 0,
@@ -32,3 +27,10 @@ const checkboxBehavior: Accessibility<CheckboxBehaviorProps> = props => ({
 })
 
 export default checkboxBehavior
+
+type CheckboxBehaviorProps = {
+  /** Whether or not item is checked. */
+  checked: boolean
+  /** If the checkbox is in disabled state. */
+  disabled?: boolean
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/Dialog/dialogBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Dialog/dialogBehavior.ts
index 5ea4104545..9fa5cc2984 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Dialog/dialogBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Dialog/dialogBehavior.ts
@@ -1,5 +1,6 @@
-import { Accessibility } from '../../types'
+import { Accessibility, AccessibilityAttributes } from '../../types'
 import popupFocusTrapBehavior from '../Popup/popupFocusTrapBehavior'
+import { PopupBehaviorProps } from '../Popup/popupBehavior'
 import * as _ from 'lodash'
 
 /**
@@ -17,7 +18,7 @@ import * as _ from 'lodash'
  * Generates unique ID and adds it as attribute 'id' to the 'content' component's part if it has not been provided by the user.
  * Traps focus inside component.
  */
-const dialogBehavior: Accessibility = (props: any) => {
+const dialogBehavior: Accessibility<DialogBehaviorProps> = props => {
   const behaviorData = popupFocusTrapBehavior(props)
   const defaultAriaLabelledBy = getDefaultAriaLabelledBy(props)
   const defaultAriaDescribedBy = getDefaultAriaDescribedBy(props)
@@ -66,3 +67,13 @@ const getDefaultAriaDescribedBy = (props: any) => {
 }
 
 export default dialogBehavior
+
+type DialogBehaviorProps = {
+  header?: {
+    id?: string
+  }
+  content?: {
+    id?: string
+  }
+} & PopupBehaviorProps &
+  Pick<AccessibilityAttributes, 'aria-label' | 'aria-labelledby' | 'aria-describedby'>
diff --git a/packages/react/src/lib/accessibility/Behaviors/Embed/embedBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Embed/embedBehavior.ts
index d2bab2c8db..0616ccc21d 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Embed/embedBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Embed/embedBehavior.ts
@@ -12,7 +12,7 @@ import { Accessibility } from '../../types'
  * Adds attribute 'aria-hidden=true', if there is no 'alt' property provided.
  * Adds attribute 'tabIndex=0' to 'root' component's part.
  */
-const embedBehavior: Accessibility = (props: any) => ({
+const embedBehavior: Accessibility<EmbedBehaviorProps> = props => ({
   attributes: {
     root: {
       'aria-hidden': props.alt || props.title ? undefined : true,
@@ -30,3 +30,10 @@ const embedBehavior: Accessibility = (props: any) => ({
 })
 
 export default embedBehavior
+
+type EmbedBehaviorProps = {
+  /** Corresponds to HTML title attribute. */
+  title?: string
+  /** Alternative text. */
+  alt?: string
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/Grid/gridBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Grid/gridBehavior.ts
index 1e13b33a6e..709681eb85 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Grid/gridBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Grid/gridBehavior.ts
@@ -6,7 +6,7 @@ import { FocusZoneDirection } from '../../FocusZone'
  * Embeds component into FocusZone.
  * Provides arrow key navigation in bidirectional direction.
  */
-const gridBehavior: Accessibility = (props: any) => ({
+const gridBehavior: Accessibility = () => ({
   attributes: {},
   focusZone: {
     mode: FocusZoneMode.Embed,
diff --git a/packages/react/src/lib/accessibility/Behaviors/Icon/iconBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Icon/iconBehavior.ts
index b7783e553e..f309b0ff57 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Icon/iconBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Icon/iconBehavior.ts
@@ -1,4 +1,4 @@
-import { Accessibility } from '../../types'
+import { Accessibility, AccessibilityAttributes } from '../../types'
 
 /**
  * @description
@@ -9,14 +9,19 @@ import { Accessibility } from '../../types'
  * Adds attribute 'aria-hidden=true', if there is no 'alt' property provided.
  * Adds attribute 'aria-hidden=true', if there is no 'aria-label' property provided.
  */
-
-const iconBehavior: Accessibility = (props: any) => ({
+const iconBehavior: Accessibility<IconBehaviorProps> = props => ({
   attributes: {
     root: {
       role: 'img',
-      'aria-hidden': props['alt'] || props['aria-label'] ? undefined : 'true',
+      'aria-hidden': props.alt || props['aria-label'] ? undefined : 'true',
     },
   },
 })
 
 export default iconBehavior
+
+type IconBehaviorProps = {
+  /** Alternative text. */
+  alt?: string
+  'aria-label'?: string
+} & Pick<AccessibilityAttributes, 'aria-label'>
diff --git a/packages/react/src/lib/accessibility/Behaviors/Image/imageBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Image/imageBehavior.ts
index 1e2bdd7a93..c4d0c0adb4 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Image/imageBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Image/imageBehavior.ts
@@ -1,4 +1,4 @@
-import { Accessibility } from '../../types'
+import { Accessibility, AccessibilityAttributes } from '../../types'
 
 /**
  * @description
@@ -8,12 +8,18 @@ import { Accessibility } from '../../types'
  * Adds attribute 'aria-hidden=true', if there is no 'alt' property provided.
  */
 
-const imageBehavior: Accessibility = (props: any) => ({
+const imageBehavior: Accessibility<ImageBehaviorProps> = props => ({
   attributes: {
     root: {
-      'aria-hidden': props['alt'] ? undefined : 'true',
+      'aria-hidden': props.alt || props['aria-label'] ? undefined : 'true',
     },
   },
 })
 
 export default imageBehavior
+
+type ImageBehaviorProps = {
+  /** Alternative text. */
+  alt?: string
+  'aria-label'?: string
+} & Pick<AccessibilityAttributes, 'aria-label'>
diff --git a/packages/react/src/lib/accessibility/Behaviors/Input/inputBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Input/inputBehavior.ts
index 1b812d6cb3..7f5746ab44 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Input/inputBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Input/inputBehavior.ts
@@ -1,5 +1,4 @@
 import { Accessibility } from '../../types'
-import * as _ from 'lodash'
 import * as keyboardKey from 'keyboard-key'
 
 /**
@@ -7,13 +6,10 @@ import * as keyboardKey from 'keyboard-key'
  * Adds attribute 'aria-disabled=true' based on the property 'disabled'. This can be overriden by providing 'aria-disabled' property directly to the component.
  * Triggers 'clear' action with 'Escape' on 'input'.
  */
-
-const inputBehavior: Accessibility = (props: any) => ({
+const inputBehavior: Accessibility<InputBehaviorProps> = props => ({
   attributes: {
     root: {
-      'aria-disabled': !_.isNil(props['aria-disabled'])
-        ? props['aria-disabled']
-        : !!props['disabled'],
+      'aria-disabled': props.disabled,
     },
   },
   keyActions: {
@@ -26,3 +22,7 @@ const inputBehavior: Accessibility = (props: any) => ({
 })
 
 export default inputBehavior
+
+type InputBehaviorProps = {
+  disabled?: boolean
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/List/basicListBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/List/basicListBehavior.ts
index 7d2e3e9547..4ee2dc4cc5 100644
--- a/packages/react/src/lib/accessibility/Behaviors/List/basicListBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/List/basicListBehavior.ts
@@ -1,4 +1,5 @@
 import { Accessibility } from '../../types'
+import { ListBehaviorProps } from './listBehavior'
 
 /**
  * @description
@@ -8,7 +9,7 @@ import { Accessibility } from '../../types'
  * Adds role='list'.
  */
 
-const basicListBehavior: Accessibility = (props: any) => ({
+const basicListBehavior: Accessibility<ListBehaviorProps> = props => ({
   attributes: {
     root: {
       role: 'list',
diff --git a/packages/react/src/lib/accessibility/Behaviors/List/basicListItemBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/List/basicListItemBehavior.ts
index ce116a8063..a86c0cc326 100644
--- a/packages/react/src/lib/accessibility/Behaviors/List/basicListItemBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/List/basicListItemBehavior.ts
@@ -1,4 +1,5 @@
 import { Accessibility } from '../../types'
+import { ListItemBehaviorProps } from './listItemBehavior'
 
 /**
  * @description
@@ -8,7 +9,7 @@ import { Accessibility } from '../../types'
  * Adds role='listitem'.
  */
 
-const basicListItemBehavior: Accessibility = (props: any) => ({
+const basicListItemBehavior: Accessibility<ListItemBehaviorProps> = props => ({
   attributes: {
     root: {
       role: 'listitem',
diff --git a/packages/react/src/lib/accessibility/Behaviors/List/listBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/List/listBehavior.ts
index 54f91bf632..724f4ad957 100644
--- a/packages/react/src/lib/accessibility/Behaviors/List/listBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/List/listBehavior.ts
@@ -6,8 +6,12 @@ import basicListBehavior from './basicListBehavior'
  * @description
  * Defines a behavior 'BasicListBehavior' or 'SelectableListBehavior' based on property 'selectable'.
  */
-
-const ListBehavior: Accessibility = (props: any) =>
+const ListBehavior: Accessibility<ListBehaviorProps> = props =>
   props.selectable ? selectableListBehavior(props) : basicListBehavior(props)
 
 export default ListBehavior
+
+export type ListBehaviorProps = {
+  /** Indicates if a list is a selectable list. */
+  selectable?: boolean
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/List/listItemBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/List/listItemBehavior.ts
index 714bf96c3f..537c16327f 100644
--- a/packages/react/src/lib/accessibility/Behaviors/List/listItemBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/List/listItemBehavior.ts
@@ -6,8 +6,14 @@ import { Accessibility } from '../../types'
  * @description
  * Defines a behavior "BasicListItemBehavior" or "SelectableListItemBehavior" based on "selectable" property.
  */
-
-const listItemBehavior: Accessibility = (props: any) =>
+const listItemBehavior: Accessibility<ListItemBehaviorProps> = props =>
   props.selectable ? selectableListItemBehavior(props) : basicListItemBehavior(props)
 
 export default listItemBehavior
+
+export type ListItemBehaviorProps = {
+  /** Indicates if a list is a selectable list. */
+  selectable?: boolean
+  /** Indicates if the current list item is selected. */
+  selected?: boolean
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/List/selectableListBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/List/selectableListBehavior.ts
index ec7d47f9b8..dc70694459 100644
--- a/packages/react/src/lib/accessibility/Behaviors/List/selectableListBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/List/selectableListBehavior.ts
@@ -1,5 +1,6 @@
 import * as keyboardKey from 'keyboard-key'
 import { Accessibility } from '../../types'
+import { ListBehaviorProps } from './listBehavior'
 
 /**
  * @description
@@ -12,7 +13,7 @@ import { Accessibility } from '../../types'
  * Triggers 'moveFirst' action with 'Home' on 'root'.
  * Triggers 'moveLast' action with 'End' on 'root'.
  */
-const selectableListBehavior: Accessibility = (props: any) => ({
+const selectableListBehavior: Accessibility<ListBehaviorProps> = props => ({
   attributes: {
     root: {
       role: 'listbox',
diff --git a/packages/react/src/lib/accessibility/Behaviors/List/selectableListItemBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/List/selectableListItemBehavior.ts
index 02c43f4810..ed24a436a8 100644
--- a/packages/react/src/lib/accessibility/Behaviors/List/selectableListItemBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/List/selectableListItemBehavior.ts
@@ -1,5 +1,6 @@
 import { Accessibility } from '../../types'
 import * as keyboardKey from 'keyboard-key'
+import { ListItemBehaviorProps } from './listItemBehavior'
 
 /**
  * @specification
@@ -7,12 +8,11 @@ import * as keyboardKey from 'keyboard-key'
  * Adds attribute 'aria-selected=true' based on the property 'selected'. Based on this screen readers will recognize the selected state of the item.
  * Triggers 'performClick' action with 'Enter' or 'Spacebar' on 'root'.
  */
-
-const selectableListItemBehavior: Accessibility = (props: any) => ({
+const selectableListItemBehavior: Accessibility<ListItemBehaviorProps> = props => ({
   attributes: {
     root: {
       role: 'option',
-      'aria-selected': !!props['selected'],
+      'aria-selected': !!props.selected,
     },
   },
   keyActions: {
diff --git a/packages/react/src/lib/accessibility/Behaviors/Menu/menuBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Menu/menuBehavior.ts
index 3ad9aedd09..2e50dc8a9c 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Menu/menuBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Menu/menuBehavior.ts
@@ -15,8 +15,7 @@ import menuDividerBehavior from './menuDividerBehavior'
  * When 'vertical' prop is used, provides keyboard navigation in vertical direction.
  * Keyboard navigation is circular.
  */
-
-const menuBehavior: Accessibility = (props: any) => ({
+const menuBehavior: Accessibility<MenuBehaviorProps> = props => ({
   attributes: {
     root: {
       role: 'menu',
@@ -37,3 +36,8 @@ const menuBehavior: Accessibility = (props: any) => ({
 })
 
 export default menuBehavior
+
+type MenuBehaviorProps = {
+  /** Indicates if menu has its items displayed vertically. */
+  vertical?: boolean
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/Menu/menuDividerBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Menu/menuDividerBehavior.ts
index 0a0c467f8a..224c7eb71e 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Menu/menuDividerBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Menu/menuDividerBehavior.ts
@@ -8,7 +8,7 @@ import { Accessibility } from '../../types'
  * Adds role 'presentation' to 'root' component's part.
  */
 
-const menuDividerBehavior: Accessibility = (props: any) => ({
+const menuDividerBehavior: Accessibility = () => ({
   attributes: {
     root: {
       role: 'presentation',
diff --git a/packages/react/src/lib/accessibility/Behaviors/Menu/menuItemBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Menu/menuItemBehavior.ts
index 05780d4fe9..edb4d193bb 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Menu/menuItemBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Menu/menuItemBehavior.ts
@@ -1,7 +1,6 @@
-import { Accessibility } from '../../types'
+import { Accessibility, AccessibilityAttributes } from '../../types'
 import { IS_FOCUSABLE_ATTRIBUTE } from '../../FocusZone/focusUtilities'
 import * as keyboardKey from 'keyboard-key'
-import * as _ from 'lodash'
 
 /**
  * @description
@@ -25,8 +24,7 @@ import * as _ from 'lodash'
  * Triggers 'openMenu' action with 'ArrowDown' on 'wrapper', when orientation is horizontal.
  * Triggers 'openMenu' action with 'ArrowRight' on 'wrapper', when orientation is vertical.
  */
-
-const menuItemBehavior: Accessibility = (props: any) => ({
+const menuItemBehavior: Accessibility<MenuItemBehaviorProps> = props => ({
   attributes: {
     wrapper: {
       role: 'presentation',
@@ -39,12 +37,8 @@ const menuItemBehavior: Accessibility = (props: any) => ({
       'aria-label': props['aria-label'],
       'aria-labelledby': props['aria-labelledby'],
       'aria-describedby': props['aria-describedby'],
-      'aria-disabled': !_.isNil(props['aria-disabled'])
-        ? props['aria-disabled']
-        : !!props['disabled']
-        ? true
-        : undefined,
-      [IS_FOCUSABLE_ATTRIBUTE]: !props['disabled'],
+      'aria-disabled': props.disabled,
+      [IS_FOCUSABLE_ATTRIBUTE]: !props.disabled,
     },
   },
 
@@ -72,3 +66,14 @@ const menuItemBehavior: Accessibility = (props: any) => ({
 })
 
 export default menuItemBehavior
+
+export type MenuItemBehaviorProps = {
+  /** Indicated if menu item has submenu. */
+  menu?: boolean | object
+  /** Defines if submenu is opened. */
+  menuOpen?: boolean
+  /** If a menu item can is currently unable to be interacted with. */
+  disabled?: boolean
+  /** If a menu displays elements vertically. */
+  vertical?: boolean
+} & Pick<AccessibilityAttributes, 'aria-label' | 'aria-labelledby' | 'aria-describedby'>
diff --git a/packages/react/src/lib/accessibility/Behaviors/Menu/submenuBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Menu/submenuBehavior.ts
index a2da1ecb35..f4e6c472b3 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Menu/submenuBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Menu/submenuBehavior.ts
@@ -13,8 +13,7 @@ import menuItemBehavior from './menuItemBehavior'
  * Keyboard navigation is circular.
  * Component will get focus when mounted.
  */
-
-const submenuBehavior: Accessibility = (props: any) => ({
+const submenuBehavior: Accessibility = () => ({
   attributes: {
     root: {
       role: 'menu',
diff --git a/packages/react/src/lib/accessibility/Behaviors/Popup/popupAutoFocusBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Popup/popupAutoFocusBehavior.ts
index a6010c3681..bf85b12b8c 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Popup/popupAutoFocusBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Popup/popupAutoFocusBehavior.ts
@@ -1,5 +1,5 @@
 import { Accessibility } from '../../types'
-import popupBehavior from './popupBehavior'
+import popupBehavior, { PopupBehaviorProps } from './popupBehavior'
 
 /**
  * @description
@@ -9,7 +9,7 @@ import popupBehavior from './popupBehavior'
  * Adds attribute 'aria-disabled=true' to 'trigger' component's part if 'disabled' property is true. Does not set the attribute otherwise.
  * Automatically focus the first focusable element inside component.
  */
-const popupAutoFocusBehavior: Accessibility = (props: any) => ({
+const popupAutoFocusBehavior: Accessibility<PopupBehaviorProps> = props => ({
   ...popupBehavior(props),
   autoFocus: true,
 })
diff --git a/packages/react/src/lib/accessibility/Behaviors/Popup/popupBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Popup/popupBehavior.ts
index 8e5ff6b60c..0d14db828a 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Popup/popupBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Popup/popupBehavior.ts
@@ -1,6 +1,7 @@
 import { Accessibility } from '../../types'
 import * as keyboardKey from 'keyboard-key'
 import * as _ from 'lodash'
+import { PopupEvents, PopupEventsArray } from '../../../../components/Popup/Popup'
 
 /**
  * @description
@@ -10,17 +11,13 @@ import * as _ from 'lodash'
  * Adds attribute 'aria-disabled=true' to 'trigger' component's part if 'disabled' property is true. Does not set the attribute otherwise.
  * Adds attribute 'role=complementary' to 'popup' component's part.
  */
-const popupBehavior: Accessibility = (props: any) => {
+const popupBehavior: Accessibility<PopupBehaviorProps> = props => {
   const onAsArray = _.isArray(props.on) ? props.on : [props.on]
   return {
     attributes: {
       trigger: {
         tabIndex: getAriaAttributeFromProps('tabIndex', props, 0),
-        'aria-disabled': !_.isNil(props['aria-disabled'])
-          ? props['aria-disabled']
-          : !!props['disabled']
-          ? true
-          : undefined,
+        'aria-disabled': props.disabled,
       },
       popup: {
         role: 'complementary',
@@ -85,3 +82,21 @@ const getAriaAttributeFromProps = (
 }
 
 export default popupBehavior
+
+export type PopupBehaviorProps = {
+  /** Events triggering the popup. */
+  on?: PopupEvents | PopupEventsArray
+  /** Indicates if popup's trigger is disabled. */
+  disabled?: boolean
+  /** Element which triggers popup */
+  trigger?: {
+    props?: {
+      /** Element type. */
+      as?: string
+      href?: string
+      tabIndex?: string
+    }
+    /** Element type. */
+    type?: string
+  }
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/Popup/popupFocusTrapBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Popup/popupFocusTrapBehavior.ts
index f1eb2b2553..c6cf39e429 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Popup/popupFocusTrapBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Popup/popupFocusTrapBehavior.ts
@@ -1,5 +1,5 @@
 import { Accessibility } from '../../types'
-import popupBehavior from './popupBehavior'
+import popupBehavior, { PopupBehaviorProps } from './popupBehavior'
 
 /**
  * @description
@@ -11,7 +11,7 @@ import popupBehavior from './popupBehavior'
  * Adds attribute 'role=dialog' to 'popup' component's part.
  * Traps focus inside component.
  */
-const popupFocusTrapBehavior: Accessibility = (props: any) => {
+const popupFocusTrapBehavior: Accessibility<PopupBehaviorProps> = props => {
   const behaviorData = popupBehavior(props)
   behaviorData.attributes.popup = {
     ...behaviorData.attributes.popup,
diff --git a/packages/react/src/lib/accessibility/Behaviors/Radio/radioGroupBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Radio/radioGroupBehavior.ts
index ee87f83cdf..9a247ff709 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Radio/radioGroupBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Radio/radioGroupBehavior.ts
@@ -9,7 +9,7 @@ import * as keyboardKey from 'keyboard-key'
  *  Triggers 'nextItem' action with 'ArrowDown' or 'ArrowRight' on 'root'.
  *  Triggers 'prevItem' action with 'ArrowUp' or 'ArrowLeft' on 'root'.
  */
-const radioGroupBehavior: Accessibility = (props: any) => ({
+const radioGroupBehavior: Accessibility = () => ({
   attributes: {
     root: {
       role: 'radiogroup',
diff --git a/packages/react/src/lib/accessibility/Behaviors/Radio/radioGroupItemBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Radio/radioGroupItemBehavior.ts
index d5a6094c85..c6d5ca93bc 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Radio/radioGroupItemBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Radio/radioGroupItemBehavior.ts
@@ -1,5 +1,4 @@
 import { Accessibility } from '../../types'
-import * as _ from 'lodash'
 
 /**
  * @specification
@@ -8,17 +7,22 @@ import * as _ from 'lodash'
  *  Adds attribute 'aria-disabled=true' based on the property 'disabled'. This can be overriden by providing 'aria-disabled' property directly to the component.
  *  Implements roving tabIndex.
  */
-const radioGroupItemBehavior: Accessibility = (props: any) => ({
+const radioGroupItemBehavior: Accessibility<RadioGroupItemBehaviorProps> = props => ({
   attributes: {
     root: {
       role: 'radio',
       tabIndex: props.checked ? 0 : -1,
       'aria-checked': props.checked,
-      'aria-disabled': !_.isNil(props['aria-disabled'])
-        ? props['aria-disabled']
-        : !!props['disabled'],
+      'aria-disabled': props.disabled,
     },
   },
 })
 
 export default radioGroupItemBehavior
+
+type RadioGroupItemBehaviorProps = {
+  /** Indicates if radio item is selected. */
+  checked?: boolean
+  /** Indicates if radio item is disabled. */
+  disabled?: boolean
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/Status/statusBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Status/statusBehavior.ts
index fcf39831c8..1aa0d7e2f9 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Status/statusBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Status/statusBehavior.ts
@@ -7,7 +7,7 @@ import { Accessibility } from '../../types'
  * @specification
  * Adds role='img'.
  */
-const statusBehavior: Accessibility = (props: any) => ({
+const statusBehavior: Accessibility = () => ({
   attributes: {
     root: {
       role: 'img',
diff --git a/packages/react/src/lib/accessibility/Behaviors/Tab/tabBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Tab/tabBehavior.ts
index 62afdbcb84..5164de15cc 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Tab/tabBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Tab/tabBehavior.ts
@@ -1,7 +1,6 @@
-import { Accessibility } from '../../types'
+import { Accessibility, AccessibilityAttributes } from '../../types'
 import * as keyboardKey from 'keyboard-key'
 import { IS_FOCUSABLE_ATTRIBUTE } from '../../FocusZone/focusUtilities'
-import * as _ from 'lodash'
 
 /**
  * @specification
@@ -17,7 +16,7 @@ import * as _ from 'lodash'
  * Adds attribute 'aria-disabled=true' to 'root' component's part based on the property 'disabled'. This can be overriden by providing 'aria-disabled' property directly to the component.
  * Triggers 'performClick' action with 'Enter' or 'Spacebar' on 'wrapper'.
  */
-const tabBehavior: Accessibility = (props: any) => ({
+const tabBehavior: Accessibility<TabBehaviorProps> = props => ({
   attributes: {
     wrapper: {
       role: 'presentation',
@@ -25,19 +24,13 @@ const tabBehavior: Accessibility = (props: any) => ({
     root: {
       role: 'tab',
       tabIndex: 0,
-      'aria-selected': !_.isNil(props['aria-selected'])
-        ? props['aria-selected']
-        : !!props['active'],
+      'aria-selected': !!props.active,
       'aria-label': props['aria-label'],
       'aria-labelledby': props['aria-labelledby'],
       'aria-describedby': props['aria-describedby'],
       'aria-controls': props['aria-controls'],
-      'aria-disabled': !_.isNil(props['aria-disabled'])
-        ? props['aria-disabled']
-        : !!props['disabled']
-        ? true
-        : undefined,
-      [IS_FOCUSABLE_ATTRIBUTE]: !props['disabled'],
+      'aria-disabled': props['disabled'],
+      [IS_FOCUSABLE_ATTRIBUTE]: !props.disabled,
     },
   },
 
@@ -51,3 +44,13 @@ const tabBehavior: Accessibility = (props: any) => ({
 })
 
 export default tabBehavior
+
+type TabBehaviorProps = {
+  /** Indicates if tab is selected. */
+  active?: boolean
+  /** Indicates if tab is disabled. */
+  disabled?: boolean
+} & Pick<
+  AccessibilityAttributes,
+  'aria-label' | 'aria-labelledby' | 'aria-describedby' | 'aria-controls'
+>
diff --git a/packages/react/src/lib/accessibility/Behaviors/Tab/tabListBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Tab/tabListBehavior.ts
index 9052bfb378..3ed34ec057 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Tab/tabListBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Tab/tabListBehavior.ts
@@ -12,7 +12,7 @@ import tabBehavior from './tabBehavior'
  * Provides arrow key navigation in bidirectional direction.
  * When component's container element receives focus, focus will be set to the default focusable child element of the component.
  */
-const tabListBehavior: Accessibility = (props: any) => ({
+const tabListBehavior: Accessibility = () => ({
   attributes: {
     root: {
       role: 'tablist',
diff --git a/packages/react/src/lib/accessibility/Behaviors/Toolbar/menuAsToolbarBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Toolbar/menuAsToolbarBehavior.ts
index 20bfe48037..3a89a28956 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Toolbar/menuAsToolbarBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Toolbar/menuAsToolbarBehavior.ts
@@ -12,7 +12,7 @@ import menuItemAsToolbarButtonBehavior from './menuItemAsToolbarButtonBehavior'
  * Provides arrow key navigation in bidirectional direction.
  * When component's container element receives focus, focus will be set to the default focusable child element of the component.
  */
-const menuAsToolbarBehavior: Accessibility = (props: any) => ({
+const menuAsToolbarBehavior: Accessibility = () => ({
   attributes: {
     root: {
       role: 'toolbar',
diff --git a/packages/react/src/lib/accessibility/Behaviors/Toolbar/menuItemAsToolbarButtonBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Toolbar/menuItemAsToolbarButtonBehavior.ts
index 42fc3b5ea7..40a18fa82d 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Toolbar/menuItemAsToolbarButtonBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Toolbar/menuItemAsToolbarButtonBehavior.ts
@@ -1,7 +1,7 @@
 import { Accessibility } from '../../types'
 import { IS_FOCUSABLE_ATTRIBUTE } from '../../FocusZone/focusUtilities'
 import * as keyboardKey from 'keyboard-key'
-import * as _ from 'lodash'
+import { MenuItemBehaviorProps } from '../Menu/menuItemBehavior'
 
 /**
  * @description
@@ -22,7 +22,7 @@ import * as _ from 'lodash'
  * Triggers 'openMenu' action with 'ArrowDown' on 'wrapper', when orientation is horizontal.
  * Triggers 'doNotNavigateNextParentItem' action with 'ArrowLeft' or 'ArrowRight' on 'wrapper', when toolbar button has submenu and it is opened.
  */
-const menuItemAsToolbarButtonBehavior: Accessibility = (props: any) => ({
+const menuItemAsToolbarButtonBehavior: Accessibility<MenuItemBehaviorProps> = props => ({
   attributes: {
     wrapper: {
       role: 'presentation',
@@ -31,15 +31,11 @@ const menuItemAsToolbarButtonBehavior: Accessibility = (props: any) => ({
       role: 'button',
       tabIndex: 0,
       'aria-haspopup': props.menu ? 'true' : undefined,
-      'aria-disabled': !_.isNil(props['aria-disabled'])
-        ? props['aria-disabled']
-        : !!props['disabled']
-        ? true
-        : undefined,
+      'aria-disabled': props['disabled'],
       'aria-label': props['aria-label'],
       'aria-labelledby': props['aria-labelledby'],
       'aria-describedby': props['aria-describedby'],
-      [IS_FOCUSABLE_ATTRIBUTE]: !props['disabled'],
+      [IS_FOCUSABLE_ATTRIBUTE]: !props.disabled,
     },
   },
 
diff --git a/packages/react/src/lib/accessibility/Behaviors/Tree/subtreeBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Tree/subtreeBehavior.ts
index 9b1a36a052..15e6e59f03 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Tree/subtreeBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Tree/subtreeBehavior.ts
@@ -5,7 +5,7 @@ import * as keyboardKey from 'keyboard-key'
  * @specification
  * Triggers 'expandSiblings' action with '*' on 'root'.
  */
-const subtreeBehavior: Accessibility = (props: any) => ({
+const subtreeBehavior: Accessibility = () => ({
   attributes: {
     root: {},
   },
diff --git a/packages/react/src/lib/accessibility/Behaviors/Tree/treeBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Tree/treeBehavior.ts
index c230a31773..b7f4d32d2a 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Tree/treeBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Tree/treeBehavior.ts
@@ -8,8 +8,8 @@ import subtreeBehavior from './subtreeBehavior'
  * Provides arrow key navigation in vertical direction.
  * Triggers 'expandSiblings' action with '*' on 'root'.
  */
-const treeBehavior: Accessibility = (props: any) => {
-  const subtreeBehaviorData = subtreeBehavior(props)
+const treeBehavior: Accessibility = () => {
+  const subtreeBehaviorData = subtreeBehavior({})
   return {
     attributes: {
       root: {
diff --git a/packages/react/src/lib/accessibility/Behaviors/Tree/treeTitleBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/Tree/treeTitleBehavior.ts
index 5d108be045..b07b241b08 100644
--- a/packages/react/src/lib/accessibility/Behaviors/Tree/treeTitleBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/Tree/treeTitleBehavior.ts
@@ -9,7 +9,7 @@ import { IS_FOCUSABLE_ATTRIBUTE } from '../../FocusZone/focusUtilities'
  * Triggers 'expand' action with 'ArrowRight' on 'root'.
  * Triggers 'collapse' action with 'ArrowLeft' on 'root'.
  */
-const treeTitleBehavior: Accessibility = (props: any) => ({
+const treeTitleBehavior: Accessibility<TreeTitleBehavior> = props => ({
   attributes: {
     root: {
       ...(props.hasSubtree && { 'aria-expanded': props.open ? 'true' : 'false' }),
@@ -34,3 +34,10 @@ const treeTitleBehavior: Accessibility = (props: any) => ({
 })
 
 export default treeTitleBehavior
+
+type TreeTitleBehavior = {
+  /** Indicated if tree title has a subtree */
+  hasSubtree?: boolean
+  /** If subtree is opened. */
+  open?: boolean
+}
diff --git a/packages/react/src/lib/accessibility/Behaviors/defaultBehavior.ts b/packages/react/src/lib/accessibility/Behaviors/defaultBehavior.ts
index 2f56420291..0386e7fcda 100644
--- a/packages/react/src/lib/accessibility/Behaviors/defaultBehavior.ts
+++ b/packages/react/src/lib/accessibility/Behaviors/defaultBehavior.ts
@@ -1,6 +1,6 @@
 import { Accessibility } from '../types'
 
-const defaultBehavior: Accessibility = (props: any) => ({
+const defaultBehavior: Accessibility = () => ({
   attributes: {
     root: {},
   },
diff --git a/packages/react/test/specs/behaviors/testDefinitions.ts b/packages/react/test/specs/behaviors/testDefinitions.ts
index 31c0e59b1c..2de9a1b8d1 100644
--- a/packages/react/test/specs/behaviors/testDefinitions.ts
+++ b/packages/react/test/specs/behaviors/testDefinitions.ts
@@ -144,7 +144,7 @@ definitions.push({
 
 // Example: Adds attribute 'aria-selected=true' to 'anchor' component's part based on the property 'active'. This can be overriden by directly providing 'aria-selected' property to the component.
 definitions.push({
-  regexp: /Adds attribute '([\w-]+)=([\w\d]+)' to '([\w-]+)' component's part based on the property '\w+'\. This can be overriden by providing '([\w-]+)' property directly to the component\./g,
+  regexp: /Adds attribute '([\w-]+)=([\w\d]+)' to '([\w-]+)' component's part based on the property '([\w-]+)'\. This can be overriden by providing '[\w-]+' property directly to the component\./g,
   testMethod: (parameters: TestMethod) => {
     const [
       attributeToBeAdded,
@@ -166,7 +166,7 @@ definitions.push({
 
 // Example: Adds attribute 'aria-disabled=true' based on the property 'disabled'. This can be overriden by providing 'aria-disabled' property directly to the component.
 definitions.push({
-  regexp: /Adds attribute '([\w-]+)=([\w\d]+)' based on the property '\w+'\. This can be overriden by providing '([\w-]+)' property directly to the component\./g,
+  regexp: /Adds attribute '([\w-]+)=([\w\d]+)' based on the property '([\w-]+)'\. This can be overriden by providing '[\w-]+' property directly to the component\./g,
   testMethod: (parameters: TestMethod) => {
     const [attributeToBeAdded, valueOfAttributeToBeAdded, overridingProperty] = parameters.props
     const propertyWithOverride = {}
diff --git a/packages/react/test/specs/components/Button/Button-test.tsx b/packages/react/test/specs/components/Button/Button-test.tsx
index 3d6984d589..35cc702dda 100644
--- a/packages/react/test/specs/components/Button/Button-test.tsx
+++ b/packages/react/test/specs/components/Button/Button-test.tsx
@@ -39,9 +39,9 @@ describe('Button', () => {
         expect(getRenderedAttribute(renderedComponent, 'aria-disabled', '')).toBe('true')
       })
 
-      test('is set to false, if disabled attribute is not provided', () => {
+      test('is set to undefined, if disabled attribute is not provided', () => {
         const renderedComponent = mountWithProviderAndGetComponent(Button, <Button />)
-        expect(getRenderedAttribute(renderedComponent, 'aria-disabled', '')).toBe('false')
+        expect(getRenderedAttribute(renderedComponent, 'aria-disabled', '')).toBe(undefined)
       })
     })
 
@@ -117,12 +117,12 @@ describe('Button', () => {
           expect(getRenderedAttribute(renderedComponent, 'aria-disabled', '')).toBe('true')
         })
 
-        test('is set to false, if disabled attribute is not provided', () => {
+        test('is set to undefined, if disabled attribute is not provided', () => {
           const renderedComponent = mountWithProviderAndGetComponent(
             Button,
             <Button accessibility={toggleButtonBehavior} />,
           )
-          expect(getRenderedAttribute(renderedComponent, 'aria-disabled', '')).toBe('false')
+          expect(getRenderedAttribute(renderedComponent, 'aria-disabled', '')).toBe(undefined)
         })
       })
     })