Tài liệu Công Nghệ Thông Tin

The requirements baseline is the set of functional and nonfunctional requirements that the development team has committed to implement in a specific release. At the time the requirements are baseline – typically following formal review and approval – they are placed under configuration management

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Requirements clarification The requirement may be badly expressed or may have accidentally omitted information which has been collected during requirements elicitation  Missing information Some information is missing from the requirements document  Requirements conflict There is a significant conflict between requirements The stakehol...

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External Interface Requirements : User Interfaces References to GUI standards Screen layout or resolution constraints Message display conventions . Hardware Interfaces: the characteristics of each interface between the software and hardware components of the system. Software Interfaces the connections between this product and other...

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The EBP (elementary business process) test: a task performed by one person in one place at one time, in response to a business event, which adds measurable business value and leaves the data in a consistent state, e.g. Approve Credit or Price Order. A common use case mistake  Defining many use cases at too low a levell that is as a signl...

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Pre-work Planning Gather information Clear schedules for the working session Refine session agenda Finalize pre-session assignments Prepare material for session (flip-charts, presentations, marker.)

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The project scope defines the concept and range of the proposed solution. The limitations itemize certain capabilities that the product will not include. The scope and limitations help to establish realistic stakeholder expectations

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Describe user goals or tasks that the users must be able to perform with the system. Valuable ways to represent user requirements include use cases, scenario descriptions, and event-response tables. An example of a use case: "Make a Reservation" using an airline, a rental car, or a hotel Web site

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Phase 3: Design the system Notice that you don’t design the new system until you have done phase 2 since that establishes the requirements it must meet! Do a preliminary design Often involves prototyping Do a detail design, showing: Input requirements Output requirements Storage requirements Processing requirements System controls Backup...

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Procedural errors When people fail to follow safe procedures, errors can occur Software errors Programmers make coding errors Famous example: Utility billing software: Customer pays early – software credits account Customer pays late – software credits account, adds late fee in for next bill Programmer forgot to consider customers who pay ex...

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Data files are files that contain data such as words, numbers, pictures, or sounds These are the files that are used in databases They have extensions such as .txt .mdb, and .xls Graphics files have extensions like .tiff, .jpeg, and .png Audio files have extensions such as .mp3, .wav, and .mid Animation/video files have extensions such as .qt,...

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