SPIRAL MODEL vs WATERFALL MODEL, AGILE MODEL vs SPIRAL MODEL, AGILE MODEL vs ITERATIVE MODEL

 SPIRAL MODEL AND WATERFALL MODEL

SPIRAL MODEL	WATERFALL MODEL
1] Spiral model is not suitable for small projects.	1] Waterfall model is suitable for small projects.
2] Better risk management.	2] High amount of risk and uncertainty.
3] Process is complex.	3] Easy to understand.
4] The process may go indefinitely.	4] Stages are clearly defined.
5] This model is suitable for long and ongoing projects.	5] This model is not suitable for long and ongoing projects.
6] Iterations are followed	6] Sequence is followed
7] Flexible with user requirements	7] Requirements once fixed cannot be modified
8] Refinements are easily possible	8] Refinements are not so easy
9] Phases  are repeated itself	9] Phases are processed and completed one at a time.

AGILE MODEL AND SPIRAL MODEL

AGILE  MODEL	SPIRAL MODEL
1] More risk of sustainability and maintenance.	1]  Better risk management
2] Minimum rules, documentation easily employed.	2] Large number of intermediate stages requires excessive documentation.
3] Little or no planning required.	3] Planning is required.
4] Easy to manage.	4] Management is more complex.
5] Early delivery of partial working solutions.	5] End of project may not be known.
6] Suitable for small projects.	6] Not suitable for small or low risk projects.
7] Depends heavily on customer interaction	7] Does not depend heavily on customer interaction
8]  Every iteration is a separate model	8]  Every iteration is not a separate model
9]  Agile is the combination of iterative and incremental	9] Spiral is the combination of iterative and waterfall

AGILE MODEL  AND ITERATIVE  MODEL

AGILE  MODEL	ITERATIVE  MODEL
1] It  contains  more risk of sustainability, maintainability and extensibility.	1] Risks are identified and resolved during iteration
2]  Agile method breaks the  the product in small incremental builds. These builds are provided in iteration.	2]  An iterative life cycle model, project is divided into different  builds  which are proceed iteratively.
3] It is incremental and iterative model. So  it can be used to build more complex project.	3]  It is iterative, all builds are developed, tested Iteratively.
4] The main focus is on adaptability and customer satisfaction with  rapid development of project	4] The main focus is on producing new version of  software at the end of each iteration to satisfy customer needs.
5]  It can be used to develop more complex projects.	5] It can not  be used for more complex projects as  iterative practice will increase complexity, time requirement.
6]  Quick in development of application	6]  Comparatively slower development
7]  Various modules of the application can be developed simultaneously	7]  Only 1 module is developed at a time
8]  Constant monitoring is required	8]  Monitoring is required after every iteration
9]  More flexible with customer requirements	9]  Less flexible
10]  Evaluation is done more frequently resulting in better error detection	10]  Evaluation is after every iteration hence errors if any are detected after a delay
11]   Progress cannot be clearly measured.	11]  Progress can be clearly measured.
12]  Less resoures are required.	12]  More resoures are required.

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