6.6.09

What Is Analysis and Design? (OOA/D)

Analysis emphasizes an investigation of the problem and requirements, rather than a solution. For example, if a new computerized library information system is desired, how will it be used?

"Analysis" is a broad term, best qualified, as in requirements analysis (an investigation of the requirements) or object analysis (an investigation of the domain objects).

Design emphasizes a conceptual solution that fulfills the requirements, rather than its implementation. For example, a description of a database schema and software objects. Ultimately, designs can be implemented.

As with analysis, the term is best qualified, as in object design or database design.

Analysis and design have been summarized in the phase do the right thing (analysis), and do the thing right (design).

What Is Object-Oriented Analysis and Design?

During object-oriented analysis, there is an emphasis on finding and describing the objects—or concepts—in the problem domain. For example, in the case of the library information system, some of the concepts include Book, Library, and Patron.

During object-oriented design, there is an emphasis on defining software objects and how they collaborate to fulfill the requirements. For example, in the library system, a Book software object may have a title attribute and a getChapter method.

Finally, during implementation or object-oriented programming, design objects
are implemented.

(Source: Larman C., Applying UML & Patterns: Introduction to Object-Oriented
Analysis & Design, & Iterative Development
)

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