Object-Oriented Analysis and Design Case Studies

Case Study 1 – The Library System

This application will support the operations of a technical library for a university department. This includes the searching for and lending of technical library materials, including books, videos, and technical journals. All library items have registration code (research area code + running number). Each borrower can borrow up to 10 items. Each type of library item can be borrowed for a different period of time (books 6 weeks, journals 3 days, videos 1 week). If returned after their due date, the employee will be charged a fine, based on the type of item (books 5:-/day, journals and videos 20:- /day). Materials will be lent to employees only if they have (1) no overdue lendables, (2) fewer than 10 articles out, and (3) total fines less than 100.

For this case, develop the following:

1.) Use case Diagram

2.) Conceptual/Domain Diagram – You will define your own fields as they are not specifically mentioned on the story.

Case Study 2 – The Downtown Rental System


DownTown Videos is a chain of 11 video stores scattered throughout a major metropolitan area in the MidWest. The chain started with a single store several years ago and has grown to its present size. Paul Lowes, the owner of the chain, knows that competing with the national chains will require a state-of-the-art movie rental system. You have been asked to develop the system requirements for the new system.


Each store has a stock of movies and video games for rent. For the first iteration, just focus on the movies. It is important to keep track of each movie title: to know and to identify its category (classical, drama, comedy, etc), its rental type (new release, standard), movie rating, and other general information such as movie producer, release date, and cost. In addition to tracking each title, the business must track individual copies to note their purchase their purchase date, condition, type (VHS or DVD), and their rental status. Use functions must be provided to maintain this inventory information.


Customers, the lifeblood of the business, are also tracked. DownTown considers each household to be a customer, so special mailings and promotions are offered to each household. For any given customer, several people may be authorized to rent videos and games. The primary contact for each customer can also establish several parameters for other members of the household. For example, the parent wants to limit a child’s rental authorization to only PG and PG-13 movies, the system will track that.


Each time a movie is rented, the system must keep track of which copies of which movies are rented, the rental date & time, and the household & person renting the movie. Each rental is considered to be open until all of the movies and games have been returned. Customers pay for rentals when checking out videos at the store.

For this case, develop the following diagrams:

1.) A use-case diagram. Analyze user functions.

2.) A conceptual model


Source: Graph Transformations and Model-Driven Engineering

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