Suppose you are writing software for a radio station that manages its playlists. The program will generate candidate playlists from a record library automatically and station personnel can then check and modifythem.

Disc jockeys must also be able to change playlists when they areused because what is actually played is often different from what isplanned. The playlists are then used to generate reports for payingroyalties.

You must decide what sort of data structure to use to storeplaylists. Make a choice and write a design rationale.

Your rationale should explain the factors that went into your decision, the designalternatives you considered, your evaluation of design decisions, andthe reasoning for your final choice.