Lecture - 6 - Software Engineering II Fall 2009 Click to...

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Click to edit Master subtitle style Software Engineering - II Fall 2009 Week # 5
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Click to edit Master subtitle style Elaboration phase
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What is Elaboration? Build the core architecture, resolve the high-risk elements, define most requirements and estimate the overall schedule and resources Elaboration is a number of iterations (2-4) where: Requirements are found and stabilized. Risks are mitigated or avoided. Infrastructure is set up refined (CVS, punchlist, testing, etc). Core architecture is designed and implemented. The Elaboration phase will result in an architectural baseline .
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What is important in Elaboration? Wide and shallow design (designing at the seams) -- identifying processes, layers, packages, and subsystems. Refine inter-module interfaces, including external modules. Integrate existing components. Adaptively design, implement, and test the core and risky parts of the architecture Write most of the use cases and other requirements in detail, through a serious of workshops, once per elaboration iteration
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Artifacts in Elaboration Domain Model Visualization of the domain concepts; it is similar to a static information model of the domain entities Design Model Set of diagrams that describes the logical design (software class diagrams, object interaction diagrams, package diagrams, and so forth) Software Architecture Document Learning aid that summarizes the key architectural issues and their resolution in the design Summary of the outstanding design ideas and their motivation
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Artifacts in Elaboration Data Model Includes the database schemas, and the mapping strategies between object and non-object representations Use-Case Storyboards, UI Prototypes Descriptions of the user interface, paths of navigation, usability models, and so forth
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What happens in each iteration? How do you decide what to address in each iteration? Risk – includes both technical complexity and other factors, such as uncertainty of effort or usability Coverage -- hit all major parts of the system early iterations Criticality – refers to functions the client considers of high business value Make a list of each Use Case or feature, and rank each along one or all of these dimensions. This list, along with supporting comments, is the core of the Software Development Plan.
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Click to edit Master subtitle style Domain Model
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Domain Model Unlike Use Cases, the Domain Model is object-oriented . The Domain Model: Is a visual dictionary of domain vocabulary and concepts. Shows conceptual classes and their associations and attributes . Should be started and completed during Elaboration. Is not a software model! Will be built gradually over several iterations.
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