Lecture 1. Software Process Models.pdf
- 1. • CSIT142A Software Engineering I SOFTWARE PROCESS MODELS Colegio De San Juan De Letran - Calamba School of Computer Studies and Technology Mr. Owen Harvey Balocon Instructor BSCS 2-1 1
- 2. SOFTWARE DEVELOPMENT LIFE CYCLE The Software Development Life Cycle alludes to a process utilized by the Software Development Industry for designing, developing, and testing software solutions. The objective of this process is to develop high- quality software solutions that exceed or meet user expectations within stipulated time frames. SDLC is also known as a software development process, which is a framework that defines software development tasks that are formed at every phase of the development process. The project follows the process which consists of a detailed plan elaborating on how to develop, maintain, alter, replace, or enhance the software solutions. A typical software process consists of multiple stages such as planning and requirement analysis, defining requirements, designing a software product architecture, developing the software solution, testing the project, deploying or maintaining the software in the market.
- 3. SOFTWARE DEVELOPMENT LIFE CYCLE
- 4. An Introduction To The Software Process Model Software processes refer to a coherent set of activities and processes required for specifying, designing, implementing, and testing the software systems. Any software process model is the abstract representation and ideation of a process that can highlight the description of a resembling process for a few specific perspectives. There are multiple software processes that majorly involve: • Specification: It defines which systems would perform what job. • Design And Implementation: It defines the organization of the software systems and their subsequent implementation. • Validation: It checks what the customer wants from the required system. • Evolution: It involves changing the system corresponding to the user requirements.
- 5. 1. Waterfall Model The Waterfall model represents a breakdown of software project activities in a linear sequential phase. Each phase of this model relies on the deliverables of the previous phase, and it corresponds to the particular aspects of the tasks. The Waterfall model is the first software process model that was introduced. This model is extremely easy to understand by the developers.
- 6. 1. Waterfall Model Each phase of this model is completed before the next phase to avoid the overlapping among the multiple phases. The Waterfall model illustrates the software process in a linear sequential flow, which means that any face of the whole process begins only if the previous phase is completed. The approach of this model is typical for most of the areas of software engineering design. It goes from requirements > design > development > testing > deployment > maintenance.
- 7. 2. Iterative Mode An Iterative software development life cycle model does not directly attempt to begin with a full specification of the prerequisites. Instead, it starts by focusing on a simplified and initial set of user features and activities. These features are then progressively developed to gain complexity and a broad range of functions until the expected software system is finished. While adopting the Iterative software model approach, the philosophy of gradual incremental development is also used liberally.
- 8. 2. Iterative Mode In simple words, an iterative approach starts by implementing and specifying just a part of the software that can be reviewed or prioritized for identifying further requirements. This process is repeated with several new versions of the software for every iteration. In any lightweight iterative software project, the project code represents the actual source of system documentation, but in a critical iterative project, formal software projection is also required.
- 9. 3. V Model The V model for software process represents a development methodology that can be considered as an extension of the Waterfall software model. In this process, instead of moving down in a unique and linear manner, the steps of the process are bent upwards soon after the coding phase, to develop a typical V shape.
- 10. 3. V Model This model represents the relationship between each phase of the software development life cycle, along with the associated phases of software testing. The horizontal and vertical axis of this model represents time/project completeness and level of abstraction, respectively.
- 11. 4. RAD Model The Rapid Application Development Model was first proposed by IBM in the 1980s. The critical feature of this model is the use of powerful development tools and techniques. A software project can be implemented using this model if the project can be broken down into small modules wherein each module can be assigned independently to separate teams. These modules can finally be combined to form the final product. Development of each module involves the various basic steps as in the waterfall model i.e analyzing, designing, coding, and then testing...
- 12. 5. Spiral Model The Spiral model refers to a test-driven software development model that was introduced for superimposing the shortcomings present in a conventional Waterfall model. The Spiral model looks exactly like a spiral having multiple loops. The exact number of spiral loops is unknown and they can differ from project to project. The Spiral model facilitates risk handling management, and the final software project is delivered in the form of loops.
- 13. 5. Spiral Model Each loop of the Spiral model is known as the phase of the whole software development process. The initial phase of the Spiral model in its early development stages of the Waterfall life cycle is required to develop the final software product. The total number of faces required to develop the software can differ from project managers and depends on associated risks.
- 14. 6. Agile Model The Agile model refers to an umbrella term for a specific set of practices and methods based on the values expressed in the same manifesto. Agile manifesto represents a way of thinking that allows businesses and team members to quickly innovate and respond to the ever-changing demands of the industry while eliminating the risks. Organizations can use the Agile methodology with the help of various available frameworks such as Kanban, Lean, Scrum, etc.
- 15. 6. Agile Model The Agile development movement also offers alternatives to conventional project management systems. The Agile model is typically used in the software development process for helping the businesses to respond proactively, referring to a group of software process methodologies.