week4-1 - Requirements Engineering What are Requirements...

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Requirements Engineering: What are Requirements? Michael Gr¨uninger Semantic Technologies Lab University of Toronto September 27, 2010 Gr¨uninger (MIE350) Requirements Engineering September 27, 2010 1 / 25
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What is a Requirement? The hardest single part of building a system is deciding what to build. A requirement is a condition or capability needed by a user to solve a problem or achieve an objective. (IEEE 610) Who is the user? What problem do they need to solve? How is this related to the capabilities of a piece of software? Gr¨uninger (MIE350) Requirements Engineering September 27, 2010 2 / 25
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The Role of Requirements The requirements specification reflects the mutual understanding of the problem to be solved between you and the customer. In the software lifecycle, the requirements specification (what is to be delivered) serves as the starting point for the design phase (how it is to be delivered). In agile methodologies, requirements emerge concurrently with prototypes. The delivered system will be assessed by testing its compliance with the requirements specification. Gr¨uninger (MIE350) Requirements Engineering September 27, 2010 3 / 25
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Requirements Engineering Process Requirements elicitation is about understanding the problem. Requirements specification is about describing the problem. Requirements validation is about agreeing upon the problem. Requirements negotiation is about fitting the problem to the situation at hand. Gr¨uninger (MIE350) Requirements Engineering September 27, 2010 4 / 25
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Overview Specification Elicitation Validation Negotiation Documentation Management Figure: Gr¨uninger (MIE350) Requirements Engineering September 27, 2010 5 / 25
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Challenge Users cannot precisely articulate all of their requirements – we often get an incomplete and inaccurate picture of the situation. Tacit knowledge – hidden assumptions are not explicitly stated Software developers are not domain specialists, yet they must identify and employ the terminology of the users with the proper meaning. Gr¨uninger (MIE350) Requirements Engineering September 27, 2010 6 / 25
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Business Requirements It is absolutely critical that the system is based on business requirements Why are you building the system?
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