Software Development Models

Values
- Individuals and interactions over processes and tools
- Working Software over comprehensive documentation
- Customer collaboration over contract negotiation
- Responding to change over following a plan
Principles
- Highest priority is to satisfy the customer through early and continuous delivery of valuable software
- Welcome changing requirements
- Deliver working software frequently
- Business people and developers must work together daily
- Build projects around motivated individuals
- Face-to-face conversation
- Working software is the primary measure of progress
- Agile processes promote sustainable development – maintain constant pace indefinitely
- Continuous attention to technical excellence and good design
- Simplicity is essential – maximizing amount of work NOT done
- Self-organizing teams
- Team reflection on effectiveness

Level 1: Initial – no defined software process
Level 2: Repeatable – basic processes, code reuse – requirements management, software project planning, tracking, oversight, quality assurance, configuration management
Level 3: Defined – formal documented software process – organization process forces and definition, training integrated software manaement
Level 4: Managed – quantitative measures, quantitative process management, software quality management
Level 5: Optimizing – continuous improvement – defect prevention, technology and process change management

1: Initiating – business reasons, build support
- Set context
- Build sponsorship
- Charter infrastructure
2: Diagnosing – analyze current state, recommend changes
- Characterize current and desired states
- Develop recommendations
3: Establishing – specific plan of action
- Set priorities
- Develop approach
- Plan actions
4: Acting – develop solutions – test, refine, implement
- Create solution
- Pilot test solution
- Refine solution
- Implement solution
5: Learning – quality improvement
- Analyze and validate
- Propose future actions

Development & Operations: interrelationship of Software Development, Operations, Quality Assurance – frequent to continuous releases of software