software engineering ii lecture 3 fakhar lodhi. software life-cycle steps life-cycle model...
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Software Engineering II
Lecture 3
Fakhar Lodhi
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Software Life-Cycle Steps
Life-cycle model (formerly, process model)
– Requirements phase– Specification phase– Design phase– Implementation phase– Integration phase– Maintenance phase– Retirement
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Different Lifecycle Models• Build-and-fix model• Waterfall model• Rapid prototyping model• Incremental model• Extreme programming• Synchronize-and-stabilize model• Spiral model• Object-oriented life-cycle models• Comparison of life-cycle models
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Build and Fix ModelBuild first
version
Modify until client is satisfied
Maintenance phase
RetirementDevelopment
Maintenance
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Waterfall ModelRequirement
Definition
System and Software Design
Implementationand Unit Testing
Integration andSystem Testing
Operation andMaintenance
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Waterfall ModelRequirement
Definition
System and Software Design
Implementationand Unit Testing
Integration andSystem Testing
Operation andMaintenance
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Rapid Prototyping
ModelRequirementDefinition
System and Software Design
Implementationand Unit Testing
Integration andSystem Testing
Operation andMaintenance
Rapid Prototyping
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The Process
• A software process is a road map that helps you create a timely, high quality result.
• It is the way we produce software• Provides stability and control• Work Product
– Programs, documents, and data produced as a consequence of the software engineering activities
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INITIAL – Ad hoc Process
REPEATABLE – Project Management
DEFINED – Process Definition
MANAGED – Process Measurement
OPTIMIZED – Process Improvement
CMM Maturity Levels
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1. Vision – focus on why2. Definition – focus on what2. Development – focus on how3. Maintenance – focus on change
Software Engineering Phases
Vision Definition Development Maintenance
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Software Lifecycle Models
• The way you organize your activities• Lifecycle model is a series of steps through which
the product progresses
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Incremental Model
For each build:Perform detailed design, implementation and integration,test, deliver to client
Maintenance phase
Requirements phase
Verify
Specification phase
Verify
Architectural design
Verify
Retirement
Development
Maintenance
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Incremental Development
Model
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Recap