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discovery is to find objects that can potentially become a part of the software system One of the first steps of the object discovery process is to examine the system specifications that are developed during the initial phases of the analysis The level of detail of the specification will certainly vary depending on the size of the project But even the smallest project should have some kind of written specification that can be used by the development team In this section, we will cover some general techniques that can be used for object discovery Two sidebars, CRC Cards (page 93) and Use Cases (page 87), cover techniques that can be used alone or combined with the techniques discussed here to help with object discovery The first step of the analysis process is to use the written problem specification to determine likely candidates for objects used in the system Objects are really instances of classes During analysis, it is often easier to think in terms of specific objects rather than the more general concept of class As the model of the system is refined, objects found in the analysis phase will be carried over directly to the design phase to create the architecture of the system, and most will eventually end up implemented as class definitions in real code One of the main differences between the analysis and design phases is the level of detail produced about the objects Objects are treated at a much higher, less detailed level during analysis The UML is especially effective at showing different levels of detail (see the sidebar on page 102) In the analysis phase, the UML can be used to show just a class or object During design, the details of specific attributes, operations, and class relationships can be added When first starting out with object discovery, try to find as many
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candidate objects as possible While finding too may objects can be a problem, it is probably better to find too many because you will be able to shorten and refine the list of candidate objects later Just because you are using an object-oriented approach, it doesn't mean the customer knows or understands anything about objects The customer may not know exactly what they want or need, and their specification is not likely to be totally accurate or complete It is common to find flaws in the customer's specification, and it is important to be able to work closely with the customer during the early stages of the project A good first pass at object discovery is to use the textual problem description to pick out the nouns and verbs The nouns represent candidate objects, and the verbs represent candidate operations or methods that go with the objects Coming up with a definitive candidate list of objects is not a trivial task, and no two analysts or designers are likely to come up with the same list Picking objects from the nouns and verbs in the description is a simple and direct way to get started Often, once a few objects have been identified, it will be easier to find other candidate objects by additional examination of the problem specification The following is a list of things to look for that can help with object discovery:
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Look at the problem space itself, together with any diagrams, pictures, and textual information provided by the customer Look at other systems that communicate or interact with the system being modeled Look at physical devices that will exist in the environment and interact with the system, regardless of the technology used to implement the system itself
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