Poor Example

This is the main screen.  The user can move songs back and forth from the Song List to the Play List.  The time left on the tape is shown at the bottom.
 
 

Better Example

Storyboard Sequence for Move Song use case

(1) This is the main screen after a file has been opened.  The song title and duration of each song in the file appears in the Song Pool.  The Time Used is initially zero, and the Remaining time shows the available time on the tape.  The user will click on a song she wants to select.

(2) The user has clicked on the song "River" to select it.  To move the selected song to the Play List, click on the ">>" button .

(3)  "River" now appears in the Play List and the time used and time remaining are automatically computed and updated beneath the playlist.  The user wants to select another song.

(4) The user has clicked on the song "California" to select it.  To move the selected song to the Play List, click on the ">>" button.  

(5) In a similar fashion the user has moved the song "California" to the Play List.
Now the user has changed her mind and doesn't want "River" in the Play List. She selects "River" by clicking on it.

(6) "River" is now selected.  To move it back to the Song Pool click on the "<<" button.  

(7) The user has clicked on the "<<" button to return the selected song to the Song Pool.  The time used and time remaining are automatically computed and updated beneath the playlist.