8.1.2003Software Engineering 2003 Jyrki Nummenmaa 1 SOFTWARE ENGINEERING - SOFTWARE LIFECYCLE MODELS...
Transcript of 8.1.2003Software Engineering 2003 Jyrki Nummenmaa 1 SOFTWARE ENGINEERING - SOFTWARE LIFECYCLE MODELS...
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8.1.2003 Software Engineering 2003Jyrki Nummenmaa
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SOFTWARE ENGINEERING -SOFTWARE LIFECYCLE MODELS
• These slides contain a few different software lifecycle models.
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THE BASIC WATERFALL MODEL
Requirement specification
Maintenance
Testing
Implementation
Analysis & Design
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A MODIFIED WATERFALL MODEL
Requirement spec. - V&V
Maintenance
- V&V
Testing - V&V
Implementation
- V&V
Analysis & Design - V&V
V&V = Verification and Validation
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PROTOTYPING FOR REQUIREMENT ANALYSIS
Requirement spec. - V&V
Maintenance
- V&V
Testing - V&V
Quick Implementa-tion - V&V
Analysis & Design - V&V
V&V = Verification and Validation
Quick Analysis & Design - V&V
Implementation
- V&V
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THE SPIRAL (ITERATIVE) MODEL
A0
A1
D1 C1
B0
B1
A2 B2
D2
D3
C2
C3
PlanningRisk analysisPrototyping
Client evaluationand input
Model simulationOperational prototypeVerification for next level
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INCREMENTAL SOFTWARE DEVELOPMENT
• It is useful to divide the development so that the subsequent releases are based on the previous releases.
• Here it is important to choose the increments in such a way, that the feedback from the previous increments shows if the development is going right.
• Also, the previous releases should be independent of the following ones.
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EVOLUTIONARY SOFTWARE DEVELOPMENT
• In evolutionary software development different activities (design, implementation, testing, and even requirements specification) may all progress at the same time.
• In this type of a situation controlling the project can be very difficult.
• Evolutionary software development may take place because it is not really known what is needed or how it can be achieved.
• Evolutionary software development may also be a sign of lack of control over the development process.
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THE MANAGEMENT VIEW
Maintenance and audit
Installation
Build new system: requirement specification, analysis & design, implementation, testing
Do a feasibility study to find out whether it is feasible to implement a new system.
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NEW DEVELOPMENTS
• Special considerations for distributed software and web-based software
• Availability of Commercial Off-The-Shelf (COTS) components.
• Many companies now work as integrators – they use COTS and subcontractors and maybe only write a minor part of the software themselves.
• “Lightweight” process models to get more flexibility.