Downloaded 13 times
More Related Content
Similar to Software development life cycle (sdlc)
Software development life cycle (sdlc)
- 2. SDLC Software development lifecycle, SDLC for short, is a well-defined, structured sequence of stages in software engineering to develop the intended software product.
- 3. SDLC PHASES •Requirements gatheringand analysis •Design •Development •Testing •Implementation •Maintenance SDLC provides a series of steps to be followed to design and develop a software product efficiently. SDLC framework includes the following steps:
- 4.
- 5. SDLC PHASE PHASE 1: - Requirements gathering • This step onwards the software development team works to carry on the project. • The team holds discussions with various stakeholders from problem domain and tries to bring out as much information as possible on their requirements. • The requirements are contemplated and segregated into user requirements, system requirements and functional requirements.
- 6. SDLC PHASES PHASE 2: - Design • Next step is to bring down whole knowledge of requirements and analysis on the desk and design the software product. • The inputs from users and information gathered in requirement gathering phase are the inputs of this step. • The output of this step comes in the form of two designs : - • Logical design, and • Physical design.
- 7. SDLC PHASES Phase 3: - Development •
- 8. SDLC PHASE PHASE 4: - Testing • An estimate says that 50% of whole software development process should be tested. • Errors may ruin the software from critical level to its own removal. • Software testing is done while coding by the developers and thorough testing is conducted by testing experts at various levels of code.
- 9. SDLC PHASE PHASE 5: - IMPLEMENTATION • This means installing the software on user machines. • At times, software needs post-installation configurations at user end. • Software is tested for portability and adaptability and integration related issues are solved during implementation.
- 10. SDLC PHASE PHASE 6: - MAINTENANCE • This phase confirms the software operation in terms of more efficiency and less errors. • If required, the users are trained on, or aided with the documentation on how to operate the software and how to keep the software operational. • The software is maintained timely by updating the code according to the changes taking place in user end environment or technology.
- 11. SDLC MODELS To helpunderstand and implement the SDLC phases various SDLC models have been created by software development experts, universities, and standards organizations.
- 12. REASONS FOR USINGSDLC MODELS •Provides basis for project planning, estimating & scheduling •Provides framework for standard set of terminologies, activities & deliverables •Provides mechanism for project tracking & control •Increases visibility of project progress to all stakeholders
- 13. ADVANTAGES OF CHOOSING ANAPPROPRIATE SDLC • Increased development speed • Increased product quality • Improved tracking & control • Improved client relations • Decreased project risk • Decreased project management overhead
- 14. LIFE CYCLE MODELS •WATER FALL • ITERATIVE • SPIRAL • EVOLUTIONARY PROCESS MODEL
- 15. LIFE CYCLE MODEL WATERFALL MODEL • This model is named “waterfall model” because its diagrammatic representation resembles a cascade of waterfalls. • This model is easy to understand and reinforces the notion of “define before design” and “design before code”. • The model expects complete & accurate requirements early in the process, which is unrealistic • Follows a sequential step-by-step process from requirements analysis to maintenance.
- 16.
- 17. PROBLEM WITH WATERFALLMODEL •It is difficult to define all requirements at the beginning of a project •This model is not suitable for accommodating any change • A working version of the system is not seen until late in the project’s life •It does not scale up well to large projects. •Real projects are rarely sequential.
- 18. LIFE CYCLE MODEL ITERATIVEMODEL • This model leads the software development process in iterations. • It projects the process of development in cyclic manner repeating every step after every cycle of SDLC process. • Every cycle produces a software, which is complete in itself and has more features and capabilities than that of the previous one. • it is easier to manage the development process but it consumes more resources.
- 19.
- 20. LIFE CYCLE MODEL SPIRALMODEL • Spiral model is a combination of both, iterative model and one of the SDLC model. • This model considers risk, which often goes un-noticed by most other models. • The model starts with determining objectives and constraints of the software at the start of one iteration. Next phase is of prototyping the software. This includes risk analysis. Then one standard SDLC model is used to build the software. In the fourth phase of the plan of next iteration is prepared.
- 21.
- 22. LIFE CYCLE MODEL EVOLUTIONARYPROCESS MODEL • Evolutionary process model resembles iterative enhancement model. The same phases as defined for the waterfall model occur here in a cyclical fashion. This model differs from iterative enhancement model in the sense that this does not require a useable product at the end of each cycle. In evolutionary development, requirements are implemented by category rather than by priority. • This model is useful for projects using new technology that is not well understood. This is also used for complex projects where all functionality must be delivered at one time, but the requirements are unstable or not well understood at the beginning.
- 23.