diff --git a/src/actions/actionTypes.ts b/src/actions/actionTypes.ts
index ec6669d687..bda0b9c966 100644
--- a/src/actions/actionTypes.ts
+++ b/src/actions/actionTypes.ts
@@ -12,34 +12,33 @@ export const CHANGE_QUERY_STRING = 'CHANGE_QUERY_STRING'
 export const GENERATE_LZ_STRING = 'GENERATE_LZ_STRING'
 
 /** Interpreter */
-export const HANDLE_CONSOLE_LOG = 'HANDLE_CONSOLE_LOG'
-export const EVAL_INTERPRETER_SUCCESS = 'EVAL_INTERPRETER_SUCCESS'
-export const EVAL_INTERPRETER_ERROR = 'EVAL_INTERPRETER_ERROR'
 export const BEGIN_INTERRUPT_EXECUTION = 'BEGIN_INTERRUPT_EXECUTION'
 export const END_INTERRUPT_EXECUTION = 'END_INTERRUPT_EXECUTION'
+export const EVAL_INTERPRETER_ERROR = 'EVAL_INTERPRETER_ERROR'
+export const EVAL_INTERPRETER_SUCCESS = 'EVAL_INTERPRETER_SUCCESS'
+export const HANDLE_CONSOLE_LOG = 'HANDLE_CONSOLE_LOG'
 
 /** Workspace */
 export const CHANGE_ACTIVE_TAB = 'CHANGE_ACTIVE_TAB'
-export const CHANGE_CHAPTER = 'CHANGE_CHAPTER'
-export const CHANGE_LIBRARY = 'CHANGE_LIBRARY'
 export const CHANGE_EDITOR_WIDTH = 'CHANGE_EDITOR_WIDTH'
+export const CHANGE_PLAYGROUND_EXTERNAL = 'CHANGE_PLAYGROUND_EXTERNAL'
 export const CHANGE_SIDE_CONTENT_HEIGHT = 'CHANGE_SIDE_CONTENT_HEIGHT'
 export const CHAPTER_SELECT = 'CHAPTER_SELECT'
-export const LIBRARY_SELECT = 'LIBRARY_SELECT'
+export const CLEAR_CONTEXT = 'CLEAR_CONTEXT'
 export const CLEAR_REPL_INPUT = 'CLEAR_REPL_INPUT'
 export const CLEAR_REPL_OUTPUT = 'CLEAR_REPL_OUTPUT'
-export const CLEAR_CONTEXT = 'CLEAR_CONTEXT'
 export const EVAL_EDITOR = 'EVAL_EDITOR'
 export const EVAL_REPL = 'EVAL_REPL'
-export const UPDATE_EDITOR_VALUE = 'UPDATE_EDITOR_VALUE'
-export const UPDATE_REPL_VALUE = 'UPDATE_REPL_VALUE'
-export const SEND_REPL_INPUT_TO_OUTPUT = 'SEND_REPL_INPUT_TO_OUTPUT'
+export const PLAYGROUND_EXTERNAL_SELECT = 'PLAYGROUND_EXTERNAL_SELECT '
 export const RESET_ASSESSMENT_WORKSPACE = 'RESET_ASSESSMENT_WORKSPACE'
+export const SAVE_GRADING_INPUT = 'SAVE_GRADING_INPUT'
+export const SEND_REPL_INPUT_TO_OUTPUT = 'SEND_REPL_INPUT_TO_OUTPUT'
 export const UPDATE_CURRENT_ASSESSMENT_ID = 'UPDATE_CURRENT_ASSESSMENT_ID'
 export const UPDATE_CURRENT_SUBMISSION_ID = 'UPDATE_CURRENT_SUBMISSION_ID'
+export const UPDATE_EDITOR_VALUE = 'UPDATE_EDITOR_VALUE'
 export const UPDATE_GRADING_COMMENTS_VALUE = 'UPDATE_GRADING_COMMENTS_VALUE'
 export const UPDATE_GRADING_XP = 'UPDATE_GRADING_XP'
-export const SAVE_GRADING_INPUT = 'SAVE_GRADING_INPUT'
+export const UPDATE_REPL_VALUE = 'UPDATE_REPL_VALUE'
 
 /** Session */
 export const FETCH_ANNOUNCEMENTS = 'FETCH_ANNOUNCEMENTS'
diff --git a/src/actions/workspaces.ts b/src/actions/workspaces.ts
index 0dcc57834b..4b5403efba 100644
--- a/src/actions/workspaces.ts
+++ b/src/actions/workspaces.ts
@@ -25,20 +25,11 @@ export const changeActiveTab: ActionCreator<actionTypes.IAction> = (
   payload: { activeTab, workspaceLocation }
 })
 
-export const changeChapter: ActionCreator<actionTypes.IAction> = (
-  newChapter: number,
-  workspaceLocation: WorkspaceLocation
-) => ({
-  type: actionTypes.CHANGE_CHAPTER,
-  payload: { newChapter, workspaceLocation }
-})
-
-export const changeLibrary: ActionCreator<actionTypes.IAction> = (
-  newLibrary: string,
-  workspaceLocation: WorkspaceLocation
+export const changePlaygroundExternal: ActionCreator<actionTypes.IAction> = (
+  newExternal: string
 ) => ({
-  type: actionTypes.CHANGE_LIBRARY,
-  payload: { newLibrary, workspaceLocation }
+  type: actionTypes.CHANGE_PLAYGROUND_EXTERNAL,
+  payload: { newExternal }
 })
 
 export const changeEditorWidth: ActionCreator<actionTypes.IAction> = (
@@ -69,21 +60,29 @@ export const chapterSelect: ActionCreator<actionTypes.IAction> = (
   }
 })
 
-export const librarySelect: ActionCreator<actionTypes.IAction> = (
-  library,
+export const playgroundExternalSelect: ActionCreator<actionTypes.IAction> = (
+  external,
   changeEvent,
   workspaceLocation: WorkspaceLocation
 ) => ({
-  type: actionTypes.LIBRARY_SELECT,
+  type: actionTypes.PLAYGROUND_EXTERNAL_SELECT,
   payload: {
-    library: library.displayName,
+    external: external.displayName,
     workspaceLocation
   }
 })
 
-export const clearContext = (workspaceLocation: WorkspaceLocation) => ({
+export const clearContext = (
+  chapter: number,
+  externals: string[],
+  workspaceLocation: WorkspaceLocation
+) => ({
   type: actionTypes.CLEAR_CONTEXT,
-  payload: { workspaceLocation }
+  payload: {
+    workspaceLocation,
+    chapter,
+    externals
+  }
 })
 
 export const clearReplInput = (workspaceLocation: WorkspaceLocation) => ({
@@ -134,12 +133,8 @@ export const sendReplInputToOutput: ActionCreator<actionTypes.IAction> = (
   }
 })
 
-export const resetAssessmentWorkspace = (chapter: number, externals: string[]) => ({
-  type: actionTypes.RESET_ASSESSMENT_WORKSPACE,
-  payload: {
-    chapter,
-    externals
-  }
+export const resetAssessmentWorkspace = () => ({
+  type: actionTypes.RESET_ASSESSMENT_WORKSPACE
 })
 
 export const updateCurrentAssessmentId = (assessmentId: number, questionId: number) => ({
diff --git a/src/components/Application.tsx b/src/components/Application.tsx
index 4178061b48..3188549023 100644
--- a/src/components/Application.tsx
+++ b/src/components/Application.tsx
@@ -11,15 +11,19 @@ import { Role, sourceChapters } from '../reducers/states'
 import NavigationBar from './NavigationBar'
 import NotFound from './NotFound'
 
-export interface IApplicationProps extends IDispatchProps, RouteComponentProps<{}> {
+export interface IApplicationProps extends IDispatchProps, IStateProps, RouteComponentProps<{}> {}
+
+export interface IStateProps {
   title: string
   accessToken?: string
   role?: Role
   username?: string
+  currentPlaygroundChapter: number
+  currentPlaygroundExternals: string[]
 }
 
 export interface IDispatchProps {
-  handleChangeChapter: (chapter: number) => void
+  handleClearContext: (chapter: number, externals: string[]) => void
   handleEditorValueChange: (val: string) => void
 }
 
@@ -66,8 +70,9 @@ const parsePlayground = (props: IApplicationProps) => {
   if (prgrm) {
     props.handleEditorValueChange(prgrm)
   }
+  /** Changes the chapter, retains the externals. */
   if (lib) {
-    props.handleChangeChapter(lib)
+    props.handleClearContext(lib, props.currentPlaygroundExternals)
   }
 }
 
diff --git a/src/components/Playground.tsx b/src/components/Playground.tsx
index 82bd9e5f56..27f93bb428 100644
--- a/src/components/Playground.tsx
+++ b/src/components/Playground.tsx
@@ -31,7 +31,7 @@ export interface IDispatchProps {
   handleEditorWidthChange: (widthChange: number) => void
   handleGenerateLz: () => void
   handleInterruptEval: () => void
-  handleLibrarySelect: (library: any, changeEvent: any) => void
+  handleExternalSelect: (external: any, changeEvent: any) => void
   handleReplEval: () => void
   handleReplOutputClear: () => void
   handleReplValueChange: (newValue: string) => void
@@ -56,8 +56,9 @@ class Playground extends React.Component<IPlaygroundProps, PlaygroundState> {
   public render() {
     const workspaceProps: WorkspaceProps = {
       controlBarProps: {
+        externalLibrary: this.props.externalLibrary,
         handleChapterSelect: this.props.handleChapterSelect,
-        handleLibrarySelect: this.props.handleLibrarySelect,
+        handleExternalSelect: this.props.handleExternalSelect,
         handleEditorEval: this.props.handleEditorEval,
         handleGenerateLz: this.props.handleGenerateLz,
         handleInterruptEval: this.props.handleInterruptEval,
@@ -71,8 +72,7 @@ class Playground extends React.Component<IPlaygroundProps, PlaygroundState> {
         hasShareButton: true,
         isRunning: this.props.isRunning,
         queryString: this.props.queryString,
-        sourceChapter: this.props.sourceChapter,
-        externalLibrary: this.props.externalLibrary
+        sourceChapter: this.props.sourceChapter
       },
       editorProps: {
         editorValue: this.props.editorValue,
diff --git a/src/components/__tests__/Application.tsx b/src/components/__tests__/Application.tsx
index 3344f41323..34f1d72bf9 100644
--- a/src/components/__tests__/Application.tsx
+++ b/src/components/__tests__/Application.tsx
@@ -8,7 +8,9 @@ test('Application renders correctly', () => {
   const props: IApplicationProps = {
     ...mockRouterProps('/academy', {}),
     title: 'Cadet',
-    handleChangeChapter: (chp: any) => {},
+    currentPlaygroundChapter: 2,
+    currentPlaygroundExternals: [],
+    handleClearContext: (chapter: number, externals: string[]) => {},
     handleEditorValueChange: (val: string) => {}
   }
   const app = <Application {...props} />
diff --git a/src/components/__tests__/Playground.tsx b/src/components/__tests__/Playground.tsx
index bc50fabae7..c3250b9037 100644
--- a/src/components/__tests__/Playground.tsx
+++ b/src/components/__tests__/Playground.tsx
@@ -16,7 +16,7 @@ const baseProps = {
   output: [],
   replValue: '',
   handleChapterSelect: (chapter: any, e: any) => {},
-  handleLibrarySelect: (library: any, e: any) => {},
+  handleExternalSelect: (external: any, e: any) => {},
   handleChangeActiveTab: (n: number) => {},
   handleEditorEval: () => {},
   handleEditorValueChange: () => {},
diff --git a/src/components/academy/grading/GradingWorkspace.tsx b/src/components/academy/grading/GradingWorkspace.tsx
index 2cda665d4e..30f134ed4f 100644
--- a/src/components/academy/grading/GradingWorkspace.tsx
+++ b/src/components/academy/grading/GradingWorkspace.tsx
@@ -40,6 +40,7 @@ export type DispatchProps = {
   handleGradingFetch: (submissionId: number) => void
   handleChangeActiveTab: (activeTab: number) => void
   handleChapterSelect: (chapter: any, changeEvent: any) => void
+  handleClearContext: (chapter: number, externals: string[]) => void
   handleEditorEval: () => void
   handleEditorValueChange: (val: string) => void
   handleEditorWidthChange: (widthChange: number) => void
@@ -47,8 +48,7 @@ export type DispatchProps = {
   handleReplEval: () => void
   handleReplOutputClear: () => void
   handleReplValueChange: (newValue: string) => void
-  /** Resetting the Assessment Workspace as this is the part of state Grading uses. */
-  handleResetAssessmentWorkspace: (chapter: number, externals: string[]) => void
+  handleResetAssessmentWorkspace: () => void
   handleSideContentHeightChange: (heightChange: number) => void
   handleUpdateCurrentSubmissionId: (submissionId: number, questionId: number) => void
 }
@@ -117,8 +117,6 @@ class GradingWorkspace extends React.Component<GradingWorkspaceProps> {
   /**
    * Checks if there is a need to reset the workspace, then executes
    * a dispatch (in the props) if needed.
-   *
-   * @param props the props passed to the component
    */
   private checkWorkspaceReset(props: GradingWorkspaceProps) {
     /* Don't reset workspace if grading not fetched yet. */
@@ -137,7 +135,8 @@ class GradingWorkspace extends React.Component<GradingWorkspaceProps> {
       const chapter = this.props.grading[questionId].question.library.chapter
       const externals = this.props.grading[questionId].question.library.externals
       this.props.handleUpdateCurrentSubmissionId(submissionId, questionId)
-      this.props.handleResetAssessmentWorkspace(chapter, externals)
+      this.props.handleResetAssessmentWorkspace()
+      this.props.handleClearContext(chapter, externals)
     }
   }
 
diff --git a/src/components/assessment/AssessmentWorkspace.tsx b/src/components/assessment/AssessmentWorkspace.tsx
index 80d9454b39..0df905e15b 100644
--- a/src/components/assessment/AssessmentWorkspace.tsx
+++ b/src/components/assessment/AssessmentWorkspace.tsx
@@ -42,6 +42,7 @@ export type DispatchProps = {
   handleAssessmentFetch: (assessmentId: number) => void
   handleChangeActiveTab: (activeTab: number) => void
   handleChapterSelect: (chapter: any, changeEvent: any) => void
+  handleClearContext: (chapter: number, externals: string[]) => void
   handleEditorEval: () => void
   handleEditorValueChange: (val: string) => void
   handleEditorWidthChange: (widthChange: number) => void
@@ -49,7 +50,7 @@ export type DispatchProps = {
   handleReplEval: () => void
   handleReplOutputClear: () => void
   handleReplValueChange: (newValue: string) => void
-  handleResetAssessmentWorkspace: (chapter: number, externals: string[]) => void
+  handleResetAssessmentWorkspace: () => void
   handleSideContentHeightChange: (heightChange: number) => void
   handleUpdateCurrentAssessmentId: (assessmentId: number, questionId: number) => void
 }
@@ -159,7 +160,8 @@ class AssessmentWorkspace extends React.Component<
       const chapter = this.props.assessment.questions[questionId].library.chapter
       const externals = this.props.assessment.questions[questionId].library.externals
       this.props.handleUpdateCurrentAssessmentId(assessmentId, questionId)
-      this.props.handleResetAssessmentWorkspace(chapter, externals)
+      this.props.handleResetAssessmentWorkspace()
+      this.props.handleClearContext(chapter, externals)
     }
   }
 
diff --git a/src/components/assessment/__tests__/AssessmentWorkspace.tsx b/src/components/assessment/__tests__/AssessmentWorkspace.tsx
index 8626b44e11..ec29808140 100644
--- a/src/components/assessment/__tests__/AssessmentWorkspace.tsx
+++ b/src/components/assessment/__tests__/AssessmentWorkspace.tsx
@@ -12,6 +12,7 @@ const defaultProps: AssessmentWorkspaceProps = {
   handleAssessmentFetch: (assessmentId: number) => {},
   handleChangeActiveTab: (activeTab: number) => {},
   handleChapterSelect: (chapter: any, changeEvent: any) => {},
+  handleClearContext: (chapter: number, externals: string[]) => {},
   handleEditorEval: () => {},
   handleEditorValueChange: (val: string) => {},
   handleEditorWidthChange: (widthChange: number) => {},
diff --git a/src/components/workspace/ControlBar.tsx b/src/components/workspace/ControlBar.tsx
index 305221cb9e..e143325e83 100644
--- a/src/components/workspace/ControlBar.tsx
+++ b/src/components/workspace/ControlBar.tsx
@@ -19,7 +19,7 @@ export type ControlBarProps = {
   sourceChapter: number
   externalLibrary?: string
   handleChapterSelect?: (i: IChapter, e: React.ChangeEvent<HTMLSelectElement>) => void
-  handleLibrarySelect?: (i: ILibrary, e: React.ChangeEvent<HTMLSelectElement>) => void
+  handleExternalSelect?: (i: IExternal, e: React.ChangeEvent<HTMLSelectElement>) => void
   handleEditorEval: () => void
   handleGenerateLz?: () => void
   handleInterruptEval: () => void
@@ -37,11 +37,11 @@ interface IChapter {
 }
 
 /**
- * Defined for displaying a library.
+ * Defined for displaying an external library.
  * @see Library under assessmentShape.ts for
  *   the definition of a Library in an assessment.
  */
-interface ILibrary {
+interface IExternal {
   key: number
   displayName: string
   externals: string[]
@@ -118,14 +118,14 @@ class ControlBar extends React.PureComponent<ControlBarProps, {}> {
     const chapterSelectButton = this.props.hasChapterSelect
       ? chapterSelect(this.props.sourceChapter, this.props.handleChapterSelect)
       : undefined
-    const librarySelectButton =
+    const externalSelectButton =
       this.props.hasChapterSelect && this.props.externalLibrary !== undefined
-        ? librarySelect(this.props.externalLibrary, this.props.handleLibrarySelect)
+        ? externalSelect(this.props.externalLibrary, this.props.handleExternalSelect)
         : undefined
     return (
       <div className="ControlBar_editor pt-button-group">
         {this.props.isRunning ? stopButton : runButton} {saveButton}
-        {shareButton} {chapterSelectButton} {librarySelectButton}
+        {shareButton} {chapterSelectButton} {externalSelectButton}
       </div>
     )
   }
@@ -201,31 +201,31 @@ const chapterRenderer: ItemRenderer<IChapter> = (chap, { handleClick, modifiers,
   <MenuItem active={false} key={chap.chapter} onClick={handleClick} text={chap.displayName} />
 )
 
-const libraries = Array.from(externalLibraries.entries()).map((entry, index) => ({
+const externals = Array.from(externalLibraries.entries()).map((entry, index) => ({
   displayName: entry[0],
   key: index,
   externals: entry[1]
 }))
 
-const librarySelect = (
-  currentLibrary: string,
-  handleSelect = (i: ILibrary, e: React.ChangeEvent<HTMLSelectElement>) => {}
+const externalSelect = (
+  currentExternal: string,
+  handleSelect = (i: IExternal, e: React.ChangeEvent<HTMLSelectElement>) => {}
 ) => (
-  <LibrarySelectComponent
+  <ExternalSelectComponent
     className="pt-minimal"
-    items={libraries}
+    items={externals}
     onItemSelect={handleSelect}
-    itemRenderer={libraryRenderer}
+    itemRenderer={externalRenderer}
     filterable={false}
   >
-    <Button className="pt-minimal" text={currentLibrary} rightIcon="double-caret-vertical" />
-  </LibrarySelectComponent>
+    <Button className="pt-minimal" text={currentExternal} rightIcon="double-caret-vertical" />
+  </ExternalSelectComponent>
 )
 
-const LibrarySelectComponent = Select.ofType<ILibrary>()
+const ExternalSelectComponent = Select.ofType<IExternal>()
 
-const libraryRenderer: ItemRenderer<ILibrary> = (lib, { handleClick, modifiers, query }) => (
-  <MenuItem active={false} key={lib.key} onClick={handleClick} text={lib.displayName} />
+const externalRenderer: ItemRenderer<IExternal> = (external, { handleClick, modifiers, query }) => (
+  <MenuItem active={false} key={external.key} onClick={handleClick} text={external.displayName} />
 )
 
 export default ControlBar
diff --git a/src/containers/ApplicationContainer.ts b/src/containers/ApplicationContainer.ts
index 15a874d8a9..4ef5ae97cd 100644
--- a/src/containers/ApplicationContainer.ts
+++ b/src/containers/ApplicationContainer.ts
@@ -2,8 +2,9 @@ import { connect, MapDispatchToProps, MapStateToProps } from 'react-redux'
 import { withRouter } from 'react-router'
 import { bindActionCreators, Dispatch } from 'redux'
 
-import { changeChapter, updateEditorValue } from '../actions'
-import Application, { IDispatchProps } from '../components/Application'
+import { clearContext, updateEditorValue } from '../actions'
+import { WorkspaceLocations } from '../actions/workspaces'
+import Application, { IDispatchProps, IStateProps } from '../components/Application'
 import { IState } from '../reducers/states'
 
 /**
@@ -13,18 +14,23 @@ import { IState } from '../reducers/states'
  * as the routing properties of @type {RouteComponentProps} are
  * provided using the withRouter() method below.
  */
-const mapStateToProps: MapStateToProps<{ title: string }, {}, IState> = state => ({
+const mapStateToProps: MapStateToProps<IStateProps, {}, IState> = state => ({
   title: state.application.title,
   accessToken: state.session.accessToken,
   role: state.session.role,
-  username: state.session.username
+  username: state.session.username,
+  currentPlaygroundChapter: state.workspaces.playground.context.chapter,
+  currentPlaygroundExternals: state.workspaces.playground.externals
 })
 
+const workspaceLocation = WorkspaceLocations.playground
+
 const mapDispatchToProps: MapDispatchToProps<IDispatchProps, {}> = (dispatch: Dispatch<any>) =>
   bindActionCreators(
     {
-      handleChangeChapter: (chapter: number) => changeChapter(chapter, 'playground'),
-      handleEditorValueChange: (val: string) => updateEditorValue(val, 'playground')
+      handleClearContext: (chapter: number, externals: string[]) =>
+        clearContext(chapter, externals, workspaceLocation),
+      handleEditorValueChange: (val: string) => updateEditorValue(val, workspaceLocation)
     },
     dispatch
   )
diff --git a/src/containers/PlaygroundContainer.ts b/src/containers/PlaygroundContainer.ts
index 1feb54f788..0b73250803 100644
--- a/src/containers/PlaygroundContainer.ts
+++ b/src/containers/PlaygroundContainer.ts
@@ -12,7 +12,7 @@ import {
   evalEditor,
   evalRepl,
   generateLzString,
-  librarySelect,
+  playgroundExternalSelect,
   updateEditorValue,
   updateReplValue,
   WorkspaceLocation
@@ -30,7 +30,7 @@ const mapStateToProps: MapStateToProps<IStateProps, {}, IState> = state => ({
   replValue: state.workspaces.playground.replValue,
   sideContentHeight: state.workspaces.playground.sideContentHeight,
   sourceChapter: state.workspaces.playground.context.chapter,
-  externalLibrary: state.workspaces.playgroundLibrary
+  externalLibrary: state.workspaces.playgroundExternal
 })
 
 const location: WorkspaceLocation = 'playground'
@@ -46,8 +46,8 @@ const mapDispatchToProps: MapDispatchToProps<IDispatchProps, {}> = (dispatch: Di
       handleEditorWidthChange: (widthChange: number) => changeEditorWidth(widthChange, location),
       handleGenerateLz: generateLzString,
       handleInterruptEval: () => beginInterruptExecution(location),
-      handleLibrarySelect: (library: any, changeEvent: any) =>
-        librarySelect(library, changeEvent, location),
+      handleExternalSelect: (external: any, changeEvent: any) =>
+        playgroundExternalSelect(external, changeEvent, location),
       handleReplEval: () => evalRepl(location),
       handleReplOutputClear: () => clearReplOutput(location),
       handleReplValueChange: (newValue: string) => updateReplValue(newValue, location),
diff --git a/src/containers/academy/grading/GradingWorkspaceContainer.ts b/src/containers/academy/grading/GradingWorkspaceContainer.ts
index c5d92aeb37..c768b8dcb4 100644
--- a/src/containers/academy/grading/GradingWorkspaceContainer.ts
+++ b/src/containers/academy/grading/GradingWorkspaceContainer.ts
@@ -15,7 +15,11 @@ import {
   updateReplValue,
   WorkspaceLocation
 } from '../../../actions'
-import { resetAssessmentWorkspace, updateCurrentSubmissionId } from '../../../actions/workspaces'
+import {
+  clearContext,
+  resetAssessmentWorkspace,
+  updateCurrentSubmissionId
+} from '../../../actions/workspaces'
 import GradingWorkspace, {
   DispatchProps,
   OwnProps,
@@ -52,6 +56,8 @@ const mapDispatchToProps: MapDispatchToProps<DispatchProps, {}> = (dispatch: Dis
       handleChangeActiveTab: (activeTab: number) => changeActiveTab(activeTab, location),
       handleChapterSelect: (chapter: any, changeEvent: any) =>
         chapterSelect(chapter, changeEvent, location),
+      handleClearContext: (chapter: number, externals: string[]) =>
+        clearContext(chapter, externals, location),
       handleEditorEval: () => evalEditor(location),
       handleEditorValueChange: (val: string) => updateEditorValue(val, location),
       handleEditorWidthChange: (widthChange: number) => changeEditorWidth(widthChange, location),
diff --git a/src/containers/assessment/AssessmentWorkspaceContainer.ts b/src/containers/assessment/AssessmentWorkspaceContainer.ts
index 93d4407482..b0ee635183 100644
--- a/src/containers/assessment/AssessmentWorkspaceContainer.ts
+++ b/src/containers/assessment/AssessmentWorkspaceContainer.ts
@@ -7,15 +7,19 @@ import {
   changeEditorWidth,
   changeSideContentHeight,
   chapterSelect,
+  clearContext,
   clearReplOutput,
   evalEditor,
   evalRepl,
   fetchAssessment,
   updateEditorValue,
-  updateReplValue,
-  WorkspaceLocation
+  updateReplValue
 } from '../../actions'
-import { resetAssessmentWorkspace, updateCurrentAssessmentId } from '../../actions/workspaces'
+import {
+  resetAssessmentWorkspace,
+  updateCurrentAssessmentId,
+  WorkspaceLocation
+} from '../../actions/workspaces'
 import AssessmentWorkspace, {
   DispatchProps,
   OwnProps,
@@ -47,6 +51,8 @@ const mapDispatchToProps: MapDispatchToProps<DispatchProps, {}> = (dispatch: Dis
       handleChangeActiveTab: (activeTab: number) => changeActiveTab(activeTab, location),
       handleChapterSelect: (chapter: any, changeEvent: any) =>
         chapterSelect(chapter, changeEvent, location),
+      handleClearContext: (chapter: number, externals: string[]) =>
+        clearContext(chapter, externals, location),
       handleEditorEval: () => evalEditor(location),
       handleEditorValueChange: (val: string) => updateEditorValue(val, location),
       handleEditorWidthChange: (widthChange: number) => changeEditorWidth(widthChange, location),
@@ -54,7 +60,7 @@ const mapDispatchToProps: MapDispatchToProps<DispatchProps, {}> = (dispatch: Dis
       handleReplEval: () => evalRepl(location),
       handleReplOutputClear: () => clearReplOutput(location),
       handleReplValueChange: (newValue: string) => updateReplValue(newValue, location),
-      handleResetAssessmentWorkspace: resetAssessmentWorkspace,
+      handleResetAssessmentWorkspace: () => resetAssessmentWorkspace,
       handleSideContentHeightChange: (heightChange: number) =>
         changeSideContentHeight(heightChange, location),
       handleUpdateCurrentAssessmentId: updateCurrentAssessmentId
diff --git a/src/reducers/states.ts b/src/reducers/states.ts
index 611f6b030e..f4c13fdbae 100644
--- a/src/reducers/states.ts
+++ b/src/reducers/states.ts
@@ -37,8 +37,7 @@ export interface IWorkspaceManagerState {
   readonly gradingCommentsValue: string
   readonly gradingXP: number | undefined
   readonly playground: IWorkspaceState
-  /** Defines the external library name to be used. */
-  readonly playgroundLibrary: string
+  readonly playgroundExternal: string
 }
 
 interface IWorkspaceState {
@@ -49,6 +48,7 @@ interface IWorkspaceState {
   readonly replValue: string
   readonly sideContentActiveTab: number
   readonly sideContentHeight?: number
+  readonly externals: string[]
 }
 
 export interface ISessionState {
@@ -132,7 +132,26 @@ const latestSourceChapter = sourceChapters.slice(-1)[0]
  * TODO use constants
  * TODO move this to a file closer to the libraries
  */
-const libEntries: Array<[string, string[]]> = [['none', []], ['sound', ['make_sourcesound']]]
+const libEntries: Array<[string, string[]]> = [
+  ['none', []],
+  [
+    'sound',
+    [
+      'make_sourcesound',
+      'get_wave',
+      'get_duration',
+      'is_sound',
+      'play',
+      'stop',
+      'cut_sourcesound',
+      'cut',
+      'sourcesound_to_sound',
+      'autocut_sourcesound',
+      'consecutively',
+      'simultaneously'
+    ]
+  ]
+]
 export const externalLibraries: Map<string, string[]> = new Map(libEntries)
 
 const currentEnvironment = (): ApplicationEnvironment => {
@@ -164,20 +183,15 @@ export const defaultEditorValue = '// Type your program in here!'
  * Takes in parameters to set the js-slang library and chapter.
  *
  * @param location the location of the workspace, used for context
- * @param chapter the chapter number for the js-slang interpreter
- * @param externals any external library exposed symbols
  */
-export const createDefaultWorkspace = (
-  location: WorkspaceLocation,
-  chapter: number = latestSourceChapter,
-  externals?: string[]
-): IWorkspaceState => ({
-  context: createContext<WorkspaceLocation>(chapter, externals, location),
+export const createDefaultWorkspace = (location: WorkspaceLocation): IWorkspaceState => ({
+  context: createContext<WorkspaceLocation>(latestSourceChapter, undefined, location),
   editorValue: defaultEditorValue,
   editorWidth: '50%',
   output: [],
   replValue: '',
-  sideContentActiveTab: 0
+  sideContentActiveTab: 0,
+  externals: []
 })
 
 export const defaultComments = 'Comments **here**. Use `markdown` if you ~~are cool~~ want!'
@@ -189,7 +203,7 @@ export const defaultWorkspaceManager: IWorkspaceManagerState = {
   gradingCommentsValue: defaultComments,
   gradingXP: undefined,
   playground: { ...createDefaultWorkspace(WorkspaceLocations.playground) },
-  playgroundLibrary: 'none'
+  playgroundExternal: 'none'
 }
 
 export const defaultSession: ISessionState = {
diff --git a/src/reducers/workspaces.ts b/src/reducers/workspaces.ts
index 5662d3fe31..41a4d012d0 100644
--- a/src/reducers/workspaces.ts
+++ b/src/reducers/workspaces.ts
@@ -2,9 +2,8 @@ import { Reducer } from 'redux'
 
 import {
   CHANGE_ACTIVE_TAB,
-  CHANGE_CHAPTER,
   CHANGE_EDITOR_WIDTH,
-  CHANGE_LIBRARY,
+  CHANGE_PLAYGROUND_EXTERNAL,
   CHANGE_SIDE_CONTENT_HEIGHT,
   CLEAR_CONTEXT,
   CLEAR_REPL_INPUT,
@@ -32,7 +31,6 @@ import {
   createDefaultWorkspace,
   defaultComments,
   defaultWorkspaceManager,
-  externalLibraries,
   InterpreterOutput,
   IWorkspaceManagerState
 } from './states'
@@ -50,8 +48,6 @@ export const reducer: Reducer<IWorkspaceManagerState> = (
     action.payload !== undefined ? action.payload.workspaceLocation : undefined
   let newOutput: InterpreterOutput[]
   let lastOutput: InterpreterOutput
-  let chapter: number
-  let externals: string[]
 
   switch (action.type) {
     case CHANGE_ACTIVE_TAB:
@@ -103,41 +99,20 @@ export const reducer: Reducer<IWorkspaceManagerState> = (
         [location]: {
           ...state[location],
           context: createContext<WorkspaceLocation>(
-            state[location].context.chapter,
-            undefined,
+            action.payload.chapter,
+            action.payload.externals,
             location
           )
         }
       }
     /**
-     * This action is only meant for Playground usage,
-     * as chapter is specified by an individual question for an
-     * Assessment.
+     * This action is only meant for Playground usage, where
+     * the external library is displayed.
      */
-    case CHANGE_CHAPTER:
-      externals = externalLibraries.get(state.playgroundLibrary) || []
+    case CHANGE_PLAYGROUND_EXTERNAL:
       return {
         ...state,
-        [location]: {
-          ...state[location],
-          context: createContext<WorkspaceLocation>(action.payload.newChapter, externals, location)
-        }
-      }
-    /**
-     * This action is only meant for Playground usage,
-     * as external library is specified by an individual question for an
-     * Assessment.
-     */
-    case CHANGE_LIBRARY:
-      chapter = state[location].context.chapter
-      externals = externalLibraries.get(action.payload.newLibrary) || []
-      return {
-        ...state,
-        [location]: {
-          ...state[location],
-          context: createContext<WorkspaceLocation>(chapter, externals, location)
-        },
-        playgroundLibrary: action.payload.newLibrary
+        playgroundExternal: action.payload.newExternal
       }
     case HANDLE_CONSOLE_LOG:
       /* Possible cases:
@@ -259,11 +234,9 @@ export const reducer: Reducer<IWorkspaceManagerState> = (
      * Resets the assessment workspace (under state.workspaces.assessment).
      */
     case RESET_ASSESSMENT_WORKSPACE:
-      chapter = action.payload.chapter
-      externals = action.payload.externals
       return {
         ...state,
-        assessment: createDefaultWorkspace(WorkspaceLocations.assessment, chapter, externals),
+        assessment: createDefaultWorkspace(WorkspaceLocations.assessment),
         gradingCommentsValue: defaultComments,
         gradingXP: undefined
       }
diff --git a/src/sagas/index.ts b/src/sagas/index.ts
index ca2ec9edbf..169fbdd201 100644
--- a/src/sagas/index.ts
+++ b/src/sagas/index.ts
@@ -10,7 +10,7 @@ import * as actionTypes from '../actions/actionTypes'
 import { WorkspaceLocation } from '../actions/workspaces'
 import { mockAssessmentOverviews, mockAssessments } from '../mocks/assessmentAPI'
 import { mockFetchGrading, mockFetchGradingOverview } from '../mocks/gradingAPI'
-import { defaultEditorValue, IState } from '../reducers/states'
+import { defaultEditorValue, externalLibraries, IState } from '../reducers/states'
 import { IVLE_KEY } from '../utils/constants'
 import { showSuccessMessage, showWarningMessage } from '../utils/notification'
 import backendSaga from './backend'
@@ -65,8 +65,16 @@ function* workspaceSaga(): SagaIterator {
   yield takeEvery(actionTypes.EVAL_EDITOR, function*(action) {
     const location = (action as actionTypes.IAction).payload.workspaceLocation
     const code: string = yield select((state: IState) => state.workspaces[location].editorValue)
+    const chapter: number = yield select(
+      (state: IState) => state.workspaces[location].context.chapter
+    )
+    const externals: string[] = yield select(
+      (state: IState) => state.workspaces[location].externals
+    )
+    /** End any code that is running right now. */
     yield put(actions.beginInterruptExecution(location))
-    yield put(actions.clearContext(location))
+    /** Clear the context, with the same chapter and externals as before. */
+    yield put(actions.clearContext(chapter, externals, location))
     yield put(actions.clearReplOutput(location))
     context = yield select((state: IState) => state.workspaces[location].context)
     yield* evalCode(code, context, location)
@@ -86,31 +94,38 @@ function* workspaceSaga(): SagaIterator {
     const location = (action as actionTypes.IAction).payload.workspaceLocation
     const newChapter = (action as actionTypes.IAction).payload.chapter
     const oldChapter = yield select((state: IState) => state.workspaces[location].context.chapter)
+    const externals: string[] = yield select(
+      (state: IState) => state.workspaces[location].externals
+    )
     if (newChapter !== oldChapter) {
-      yield put(actions.changeChapter(newChapter, location))
+      yield put(actions.clearContext(newChapter, externals, location))
       yield put(actions.clearReplOutput(location))
       yield call(showSuccessMessage, `Switched to Source \xa7${newChapter}`)
     }
   })
 
   /**
-   * Note that the LIBRARY_SELECT action can only select the library for playground.
+   * Note that the PLAYGROUND_EXTERNAL_SELECT action is made to
+   * select the library for playground.
    * This is because assessments do not have a chapter & library select, the question
    * specifies the chapter and library to be used.
    *
    * To abstract this to assessments, the state structure must be manipulated to store
-   * Library in a IWorkspaceState (as compared to IWorkspaceManagerState).
+   * the external library name in a IWorkspaceState (as compared to IWorkspaceManagerState).
    *
    * @see IWorkspaceManagerState @see IWorkspaceState
    */
-  yield takeEvery(actionTypes.LIBRARY_SELECT, function*(action) {
+  yield takeEvery(actionTypes.PLAYGROUND_EXTERNAL_SELECT, function*(action) {
     const location = (action as actionTypes.IAction).payload.workspaceLocation
-    const newLibrary = (action as actionTypes.IAction).payload.library
-    const oldLibrary = yield select((state: IState) => state.workspaces.playgroundLibrary)
-    if (newLibrary !== oldLibrary) {
-      yield put(actions.changeLibrary(newLibrary, location))
+    const chapter = yield select((state: IState) => state.workspaces[location].context.chapter)
+    const newExternal = (action as actionTypes.IAction).payload.external
+    const oldExternal = yield select((state: IState) => state.workspaces.playgroundExternal)
+    if (newExternal !== oldExternal) {
+      const externals = externalLibraries.get(newExternal)!
+      yield put(actions.changePlaygroundExternal(newExternal))
+      yield put(actions.clearContext(chapter, externals, location))
       yield put(actions.clearReplOutput(location))
-      yield call(showSuccessMessage, `Switched to ${newLibrary} library`)
+      yield call(showSuccessMessage, `Switched to ${newExternal} library`)
     }
   })