03-Requirements

03-Requirements - Requirements analysis What do...

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1 Requirements analysis z What do stakeholders want from the system? What should it to do? What should it look like? Sound like? Be like? z Analysis starts with a project description Usually written (or otherwise expressed) by major stakeholder z a.k.a. “Client” – might be a customer, another department in the company, management, professor, … z Or project team writes it for an anticipated market z Results in a series of RA artifacts : 2 purposes Shows the client what they will be getting Used to kick-off and guide later development activities RA starts in UP Phase I: Inception z Purpose is to explore project feasibility z Target length: only about a week z Identify most use cases and actors – And write 10-20% of use cases in detail – Used to make rough estimate of costs z Most important requirements artifacts: vision, use cases Project descriptions z Client’s view : system is basically a “black box” z Probably vague, repetitive, confused, … But remember: client thinks it “says it all” z Often has too many details, or misguided focus e.g., implementation details – too limiting at this stage e.g., too many “ilities” – distract from the purpose z May contain contradictions or impossible parts Often just “wish lists” without clear goals z So, always expect to re-express as requirements Doing requirements analysis z Basically: detailing the requirements But still in language that the user understands z i.e., all artifacts continue to treat the system as a black box – focus on what goes in and what comes out For CS 50: write a vision (beefed up) and use cases z Study much more than the project description Interview users, managers, sponsors, experts, … Learn about current practices, existing systems, business rules (general and specific), memo trails, … But no need to become a domain expert z Could take years! A “knowledgeable layperson” is sufficient. Vision 1: problem statement z Should answer two fundamental questions: What problem(s) will the system solve?
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