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technology that will be used to implement the system If it is not, then it isn't an essential object, but rather an implementation object that should wait until a later stage of development for more consideration All the attributes of a proposed class should apply to all the objects in that class If you find exceptions (eg, this attribute applies in all cases except for that special object), then you may have combined subclasses when they should be part of a hierarchy While you will want to combine classes as much as you can, it will sometimes be necessary to split a class into more specialized subclasses Many of the "smells" applied to refactoring apply equally well to a design See 8, Refactoring Just as all the attributes should apply to every instance, all methods, or operations, should apply to all objects in the class
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CRC Cards CRC Cards represent a simple yet useful OOA technique CRC stands for Class-Responsibility-Collaborator The idea is to generate a set of 3x5 or 4x6 index cards that include the classes that make up a system Each card lists the name of the class, the responsibilities of the class, and other classes the class uses or collaborates with These cards are usually generated in an interactive work sessions involving the customers, analysts, and developers While a set of CRC cards might be used to eventually generate UML diagrams, they are really most useful for exploring interactions between classes in an open discussion format
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CRC cards were originally developed in the late 1980's by Kent Beck and Ward Cunningham as a technique to help procedural programmers move to the design perspective needed by object-oriented programming In many ways, CRC cards are so easy and basic that their original paper still stands as a good reference CRC cards have been found to be so useful that they have become a standard OO design tool
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The top line of the card specifies the name of the class in large letters A class, of course, is a collection of objects - the things of most interest in the system being modeled
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The responsibilities of the class are listed on the left side of the card A responsibility is a high-level description of what the class does The responsibilities should be short, concise descriptions of what the class knows about, and what it does with that information One of the points of the small CRC card is to force you to keep these descriptions small, and highlevel Any class should probably not have more than two or three responsibilities Thinking in terms of responsibilities is important because it gets away from a data centric view of objects On the right side is a list of collaborator classes These are classes that provide information or services for the class at hand Each collaborator class will have its own CRC card Note that a collaborator is a class that is used by the given class - the collaborator CRC card will not necessarily list the classes that use it As more CRC cards are added, they can be laid out and physically grouped by classes that are related The backs of the CRC cards are often used to give more details of the data and methods needed to implement the class These details can be used later when the classes are actually implemented in code Note that you are only allowed to write as much as will fit on the card This helps your classes from getting too big or complex The section in 5 on MVC has an example using CRC cards
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