1_System Development Lifecycle

1_System Development Lifecycle

1. Predictive Approach

   • waterfall model
     • phases
       • system engg
       • req & spec
       • design
       • coding
       • testing
       • maintenance
     • ads
       • distinct phases
       • natural app.
       • high visibility
     • disads
       • cannot go back
       • natural
       • no model until final phase

2. Adaptive Approach

   • spiral model
     • ads
       • enables to understand and react
       • risk reduction
       • systematicc approach
     • phases
       • customer communication
       • planning
       • risk analysis
       • engg
       • construction & release
       • customer evaluation
     • disads
       • risk in development
       • difficult to follow
       • risk assessment costs more