Software Development- waterfall model and RAD

WATERFALL LIFE CYCLE MODEL
1. Each step is completed at a time from start to finish
2. Each step/ stage must be completed before you can move onto the next one
3. Better used for smaller projects because the requirements are well known-and any changes would mean that you can easily jump back to the previous stage
4. Stages of the life cycle:
  1. 1. REQUIREMENTS- expectations and goals of the project are defined in this stage. System analysts do this.
  2. 2. DESIGN- after the goals have established, work commences on designing the product and plans are made.
  3. 3. CONSTRUCTION- the software/code for the project is written
  4. 4. TESTING AND DEBUGGING- software is tested to make sure is meets the client's requirements
  5. 5. INSTALLATION- product is implemented according to the agreed reuirements
  6. 6. MAINTENANCE- the product is sent to the client and support of the product is put into place
5. ADVANTAGES
  1. Well suited for projects where quality is emphasised over cost or time-requirements
  2. Lack of any overlap between phases avoids confusion
  3. High visibility-demonstrate output can be seen
6. DISADVANTAGES
  1. Not suitable for large-scale projects
  2. Changes in requirements later in the stage may take longer to create as you have to go back to the original stage
  3. Not suited for the fast changing computers in today's world. Software may not work on different computers
RAD- rapid application development
1. Emphasising rapid prototyping and iterative delivery.
2. Produces successive prototypes of the software
3. Rigidly placed schedule that defers design improvements to the next product
4. MAIN STAGES OF RAD
  1. Make of improve a prototype
  2. Evaluate the prototype
  3. Repeat until the job is done
5. ADVANTAGES
  1. User involvement- the user can use the software and give feedback on a live system-so no time will be waster going back to the design level as you do it as you go along
  2. Errors will be found much earlier on in the stage
6. DISADVANTAGES
  1. Requires highly skilled programmers and designers
  2. Only a system that can be modulised can use RAD

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Software Development- waterfall model and RAD

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	Erstellt von Jaya Sharma vor fast 7 Jahre