SDLC presentation-1.pptx
- 1. Software Development Life Cycle
- 2. What is SDLC? SDLC is a process followed for a software project, within a software organization. It consists of a detailed plan describing how to develop, maintain, replace and alter or enhance specific software. The life cycle defines a methodology for improving the quality of software and the overall development process.
- 3. The following figure is a graphical representation of the various stages of a typical SDLC.
- 4. Stage1: Planning and requirement analysis ● Requirement Analysis is the most important and necessary stage in SDLC. ● The senior members of the team perform it with inputs from all the stakeholders and domain experts in the industry. ● Planning for the quality assurance requirements and identifications of the risks associated with the projects is also done at this stage.
- 5. Stage2: Defining Requirements • Once the requirement analysis is done, the next stage is to clearly define and document the software requirements and get them approved from the project stakeholders. • This is accomplished through "SRS"- Software Requirement Specification document which contains all the product requirements to be designed and developed during the project life cycle. SRS is the reference for product architects to come out with the best architecture for the product to be developed.
- 6. Stage3: Designing the Software • Based on the requirements specified in SRS, usually more than one design approach for the product architecture is proposed and documented in a DDS - Design Document Specification. • This DDS is reviewed by all the important stakeholders and based on various parameters such as risk assessment, product robustness, design modularity, budget, and time constraints, the best design approach is selected for the product.
- 7. Stage4:Coding Programmers begin working on writing code to meet business requirements Developers must follow the coding guidelines defined by their organization Programmers will look to reuse code from previous projects to save time Unit testing should begin at this point Many projects will begin to do demonstrations at this point
- 8. Stage5:Testing This is critical step to ensure the system to work properly Systems may have multiple layers of testing 1. Unit test 2. Integration test 3. Load test 4. User acceptance test(UAT) This step lots of time and money to deliver the quality product If in case the product get failed in test or it did not satisfy the user then it again go to the developing phase to rectify the problems
- 9. Stage6:Deployment The deployment phase is the final phase of the software development life cycle (SDLC). After the project team tests the product and the product passes each testing phase, the product is ready to go live and overall project definition are made available for use and puts the product into production and after the product is manufactured and put sale in the market. It means that the product is ready to be used in a real environment by all end users of the product.
- 10. Stage7:Maintenance The maintenance phase of the SDLC occurs after the product is in full operation. Maintenance of software can include software upgrades, repairs, and fixes of the software if it breaks. Software applications often need to be upgraded or integrated with new systems the customer deploys. It's often necessary to provide additional testing of the software or version upgrades. During the maintenance phase, errors or defects may exist, which would require repairs during additional testing of the software. Monitoring the performance of the software is also included during the maintenance phase.
- 11. SDLC Models • A framework that describes the activities performed at each stage of a software. • The most important and popular SDLC models: 1. Waterfall Model 2. Iterative Model 3. Spiral Model 4. V-Model 5. Big Bang Model
- 12. Waterfall Model • The Waterfall Model was first Process Model to be introduced. • The waterfall model is a linear, sequential approach to Development Life Cycle(SDLC) that is popular in software product development. • It is also referred to as a linear-sequential life cycle model. • In a waterfall model, each phase must be completed fully before phase can begin.
- 14. Advantages of waterfall Model • This model is simple and easy to understand and use. • It is easy to manage due to the rigidity of the model – each phase has specific deliverables and a review process. • In this model phases are processed and completed one at a time. • Waterfall model works well for smaller projects where requirements are clearly defined and very well understood.
- 15. Disadvantages of waterfall Model • Once an application is in the testing stage, it is very difficult to go back and change something that was not well-thought out in the concept stage. • No working software is produced until late during the life cycle. • Poor model for long and ongoing projects. • High amounts of risk and uncertainty.
- 16. Thank you