Sequence Diagrams

Use Case 1: Account Login

1. The user opens the Smart Lang app, and login options are displayed on the landing page.
2. The user enters their username and password (or uses the app without registration in offline mode).
3. The app sends credentials to the superlogin authentication service.
4. superlogin validates the credentials against the CouchDB user database.
5. If valid, a session token is returned and the app syncs local PouchDB data with the remote CouchDB server.
6. The user is directed to the homepage and can access the AAC board. If credentials are invalid, the user is notified that login failed.

Use Case 2: Offline Accessibility

1. The user opens the Smart Lang app and continues in offline mode, which is displayed on the landing page.
2. The system loads any cached data stored by the Service Worker.
3. The user is directed to the homepage and can access the AAC board.

Use Case 3: Sentence Creation (Without Suggestion)

1. The user views words from the AAC board on the homepage.
2. The user selects a word.
3. The system adds the selected word to the speech box.
4. The user searches for the next word on the board.
5. The user adds more words to the speech box.
6. The system continues to add each word to the speech box after the last selected word.
7. The user presses the Speak button.
8. The system reads the complete sentence using text-to-speech.

Use Case 4: Sentence Creation (With Suggestion)

1. The user views words from the AAC board on the homepage.
2. The user selects a word.
3. The system adds the selected word to the speech box.
4. The user searches for the next word on the board.
5. The user views suggested words on the “Suggested Words Box” displayed on the AAC board.
6. The user clicks and adds a word from the suggested words box.
7. The system continues to add each word to the speech box after the last selected word.
8. The user presses the Speak button.
9. The system reads the complete sentence using text-to-speech.

Use Case 5: Sentence Editing

1. The user views the sentence on the speech box from the AAC board on the homepage.
2. The user selects a word to be deleted.
3. The system deletes the selected word from the speech box.
4. The user views and searches for the next word on the board.
5. The user selects a word.
6. The system adds the selected word to the speech box.
7. The user presses the Speak button.
8. The system reads the updated sentence using text-to-speech.

Use Case 6: Caregiver Adds Vocabulary (Without Suggestion)

1. The caregiver clicks on the Caregiver page.
2. The system displays the caregiver page and the vocabulary management button.
3. The caregiver clicks on the vocabulary management button.
4. The caregiver selects Add New Word.
5. The system displays vocab words from the board.
6. The caregiver views and searches for vocab words.
7. The caregiver clicks and submits the selected word.
8. The system saves the new word to the database.
9. The system updates the AAC board with the new vocabulary word.

Use Case 7: Caregiver Adds Vocabulary (With Suggestion)

1. The caregiver clicks on the Caregiver page.
2. The system displays the caregiver page and the vocabulary management button.
3. The caregiver clicks on the vocabulary management button.
4. The caregiver selects Add New Word.
5. The system displays suggested vocab words based on the user's experience.
6. The caregiver views and searches through the suggested vocab words.
7. The caregiver clicks and submits the suggested vocabulary word
8. The system saves the new word to the database.
9. The system updates the AAC board with the new vocabulary word.

Use Case 8: Caregiver Removes Vocabulary

1. The caregiver clicks on the Caregiver page.
2. The system displays the caregiver page and the vocabulary management button.
3. The caregiver clicks on the vocabulary management button.
4. The caregiver selects Remove Word.
5. The system displays the user's current AAC vocab words from the board.
6. The caregiver views and searches for the vocab word to remove.
7. The caregiver clicks and submits the selected word to remove.
8. The system saves and removes the word from the database.
9. The system updates the AAC board with the removed vocabulary word.