Different between waterfall vs spiral and incremental model

Question

Brahma Prakash Shukla · Answer

Properties of Model Water-Fall Model Incremental Model Spiral Model Rad Model Planning in early stage Yes Yes Yes No Returning to an earlier phase No Yes Yes Yes Handle Large-Project Not Appropriate Not Appropriate Appropriate Not Appropriate Detailed Documentation Necessary Yes but not much Yes Limited Cost Low Low Expensive Low Requirement Specifications Beginning Beginning Beginning Time boxed release Flexibility to change Difficult Easy Easy Easy User Involvement Only at beginning Intermediate High Only at the beginning Maintenance Least Promotes Maintainability Typical Easily Maintained Duration Long Very long Long Short Risk Involvement High Low Medium to high risk Low Framework Type Linear Linear + Iterative Linear + Iterative Linear Testing After completion of coding phase After every iteration At the end of the engineering phase After completion of coding Overlapping Phases No Yes (As parallel development is there) No Yes Maintenance Least Maintainable Maintainable Yes Easily Maintainable Re-usability Least possible To some extent To some extent Yes Time-Frame Very Long Long Long Short Working software availability At the end of the life-cycle At the end of every iteration At the end of every iteration At the end of the life cycle Objective High Assurance Rapid Development High Assurance Rapid development Team size Large Team Not Large Team Large Team Small Team Customer control over administrator Very Low Yes Yes Yes