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Software life cycle comparison


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Software life cycle comparison

  2. 2. IntroductionWhat is Software Lifecycle? Series of stages in the development of software Often used in Software Engineering E.g. analysis, designs, implementation, tests, maintenance
  3. 3. Software Lifecycle Models Waterfall Model Prototype Model Spiral Model Agile Model
  4. 4. Waterfall Model Simplest software model Sequential design process Clear project objectives Stable project requirements. Concrete and clear approach to software development Amount of resources required is very minimal i.e. cheaper
  5. 5. Waterfall Model Strengths of Waterfall Model  Minimizes planning overhead since it can be done up front.  Structure minimizes wasted effort, so it works well for technically weak or inexperienced staff.
  6. 6. Waterfall Model Weaknesses of Waterfall Model  Inflexible  Onlythe final phase produces a non documentation deliverable  Backing up to address mistakes is difficult.
  7. 7. Prototype Model Overcomes limitations of Waterfall model Prototype is made which is further modified as per the requirement of the customer
  8. 8. Prototype Model Strengths of Prototype Model  Early functionality.  Provides a process to perfect the requirements definition.  Provides risk control.  Documentation focuses on the end product not the evolution of the product.
  9. 9. Prototype Model Weaknesses of Prototype Model  Less applicable to existing systems than to new, original development.  Bad reputation among conservatives as a "quick and dirty" method.  Suffers from bad documentation  Sometimes produces a system with poor performance.  Tendency for difficult problems to be pushed to the future so that the initial promise of the prototype is not met by subsequent products plans.
  10. 10. Spiral Model combines elements of both design and protoypein-stages
  11. 11. Agile Model It is an enhanced development software, not a alternative option. It is a distinct software development method. Its an iterative method.
  12. 12. Agile Model Advantages  Agile by definition would naturally refer to something which is quick and easy to do.  They are test-driven software development.  It provides advice for how to be effective as a modeler.
  13. 13. Agile Model Disadvantages  Difficult to apply where there are large team members.  May increase the complexity of the system as scope of the system may expand beyond original plan.  It does not define detailed procedures for how to create a given type of model.