Software development life cycle (SDLC) Models
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The document provides an overview of different software development life cycle (SDLC) models including Waterfall, RAD, Spiral, WinWin Spiral, and Prototype models. It describes the key phases and advantages/disadvantages of each model. The Waterfall model is the earliest and most basic sequential model but lacks flexibility. The RAD model focuses on rapid prototyping and incremental development. The Spiral model incorporates risk analysis in an iterative process. WinWin Spiral model involves negotiation between developers and customers.
Software development life cycle (SDLC) Models
- 1. SOFTWARE DEVELOPMENT LIFE CYCLE & ITS MODELS Presented By: Asmita Singh
- 2. List of Contents 1.) SDLC & ITS PHASES 2.) WATERFALL MODEL: ADVANTAGES & DISADVANTAGES 3.) RAD MODEL: ADVANTAGES & DISADVANTAGES 4.) SPIRAL MODEL 5.) WINWIN SPIRAL MODEL 6.) PROTOTYPE MODEL
- 3. SDLC Software Development Life Cycle (SDLC) is a process used by the software industry to design, develop and test high quality softwares. The SDLC aims to produce a high-quality software that meets or exceeds customer expectations, reaches completion within times and cost estimates.
- 5. WATERFALL MODEL In "The Waterfall" approach, the whole process of software development is divided into separate phases.It is also referred to as a linear-sequential life cycle model. The Waterfall model is the earliest SDLC approach that was used for software development. It is best suited for those projects in which requirements are already stated at the very begining of the project cycle.
- 7. The sequential phases in Waterfall model are − Requirement Gathering and analysis − All possible requirements of the system to be developed are captured in this phase and documented in a requirement specification document. System Design − This system design helps in specifying hardware and system requirements and helps in defining the overall system architecture. Implementation − With inputs from the system design, the system is first developed in small programs called units, which are integrated in the next phase. Add a little bit of body text
- 8. Integration and Testing − All the units developed in the implementation phase are integrated into a system after testing of each unit. . Deployment of system − Product is deployed in the customer environment or released into the market. Maintenance −To enhance the product, some better versions are released and check regular updates. Maintenance is done to deliver these changes in the customer environment.
- 9. Waterfall Model - Advantages 1.) Simple and easy to understand and use 2.) Phases are processed & completed one at a time. 3.) Works well for smaller projects where requirements are very well understood 4.) Clearly defined stages.
- 10. Waterfall Model - Disadvantages 1.) Poor model for long and ongoing projects. 2.) Cannot accommodate changing requirements. 3.) There is no going back on a previous stage due to the waterfall nature of the model. 4.) Extremely time consuming model 5.) Unable to build a prototype while the lifecyle and hence one has to wait until the end.
- 11. RAD Model Rapid Application Development focuses on gathering customer requirements through workshops or focus groups, early testing of the prototypes by the customer using iterative concept, reuse of the existing prototypes (components), continuous integration and rapid delivery. In the RAD model, the functional modules are developed in parallel as prototypes and are integrated to make the complete product for faster product delivery. TEAM + TIME = RAD
- 13. RAD projects follow iterative and incremental model and have small teams comprising of developers, domain experts, customer representatives and other IT resources working progressively on their component or prototype Phases of the RAD Model 1.) Business Modeling: A complete business analysis is performed to find the vital information flow and its processing for business. 2.) Data Modelling: The information gathered in the Business Modeling phase is reviewed and analyzed to form sets of data objects vital for the business
- 14. 3.) Process Modelling: The data object sets defined in the Data Modeling phase are converted to establish the business information flow needed to achieve specific business objectives as per the business model. 4.)Application Generation: final product(app) gets generated and coded. 5.)Testing & Turnover: The overall testing time is reduced in the RAD model as the prototypes are independently tested during every iteration.
- 15. RAD: Advantages 1.) This model ensures a speedified delivery of the product 2.) Teams help in parallel functioning of the models and functional prototypes. 3.) Iteration time can be short with use of powerful RAD tools. 4.) Encourages customer feedback
- 16. RAD: Disadvantages 1.) Dependency on technically strong team members for identifying business requirements. 2.) Inapplicable to cheaper projects as cost of modeling and automated code generation is very high.
- 17. Spiral Model This Spiral model is a combination of iterative development process model and sequential linear development model i.e. the waterfall model Key Feature: Risk Analysis
- 19. Spiral model consists of six spirals and there are four phases in each spiral. The four phases are: 1.) Product Concept 2.) Product Design 3.) Product Testing 4.) Product Delivery PROS & CONS PROS: 1.) Customer communication & evaluation is involved at every stage. 2.) Risk Driven feature curbs and analyze the probable future risks.
- 20. CONS 1.) A Risk Analyst has to be hired for this model in the company. 2.) It is a time consuming model . 3.) Not suitable for small or low risk projects and could be expensive for small projects. WINWIN Spiral Model In this model, a process of negotiation takes place between the customer and the developer. the customer wins by getting the desired functionalities and developer gets satisfied by the desired cost and budgeting by the customer
- 21. PROTOTYPE MODEL
- 22. Thank You