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02-Process - Development process models Requirements...

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1 Development process models z The classic One step leads to another … No going back z Software “engineering” in action Requirements Analysis System Design Program Design Coding Testing (several steps) Operation & Maintenance The Waterfall Model Software development activities z Note “activities” – not “steps” z Often happening simultaneously z Not necessarily discrete 1. Planning: mostly study the requirements 2. Domain analysis: study the problem area 3. System design: devise the computer solution 4. Implementation: the easy step? 5. Testing, documentation, maintenance, … Alternatives to waterfall model z Okay, we all agree – this extreme doesn’t work either z Is there a middle ground? Requirements Analysis System Design Unit Testing Software Development Reality Integration Testing Maintenance Delivery System Testing Coding Program Design Risk – another reality In a waterfall lifecycle, high risk issues such as integration and load test may be tackled late. Time Potential impact of risks being tackled Requirements Analysis Design Implement Integrate & System Test z Considered wise to tackle risky issues early Engineering the risk factor z Spiral Model – Includes frequent risk analyses – Frequent reevaluation during an extended planning stage Testing and iterating z Because we make mistakes z Requirements change too Clients don’t always know
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