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Explanation About Software Project Lifecycle Model

Dec, 02 2020, 12:39 pm [IST]
Explanation About Software Project Lifecycle Model

Waterfall Model

The waterfall model also called classic life cycle requirements is well defined and stable. It suggests a systematic, sequential approach to software development. It begins with customer specification of requirements and processes through planning, modeling, instruction, and deployment.

The problem of the waterfall model

  • Real projects rarely this model. As changes can confuse as the project team precedes.
  • It is difficult for the customer to state all requirements.
  • It has difficulty accommodating the natural uncertainty that exists at the beginning of many projects.
  • The customer must have patience.
  • A working version of the programs will not be available until late in the project time-span.
  • Mistakes can be revealed only at the later stage of the project

Spiral model

Originally proposed by Boehm, is an evolutionary s/w process. It couples iterative prototyping, with the controlled and systematic aspects of the waterfall mod to provides the potential for rapid development of an increasingly more complete version of the s/w. The spiral development model is a risk-driven model generator that is used to guide multi-stakeholder concurrent engineering of software-intensive systems.

It has two main distinguishing features. One is the cyclic approach for incrementally growing a System's degree of definition implementation while decreasing its degree of risk. Another one is a set of anchor point milestones for ensuring stakeholder commitment to solutions.

Customer communication

Tasks ok acquired establishing effective communication between developer and customers.

Planning

Contains tasks, required to defend resources time Bound and other needed information

Risk analysis

Tasks required to access technical and management risks.

Engineering

Tasks required to build one or more presentations of the application.

Construction and release

Tasks required to construct, test, install, and support you.

Customer evolution

Tasks required to obtain customer feedback based on software representations created during the engineering stage and implemented during the installation stage. Contains a set of tasks the deposit has to undertake. Task set size depends upon the complexity of projects. For small projects, this set of small and the size increases with increases in complexity.

As the process begins, this software engineering team most around the spiral in a clockwise direction, what's your cycle is complete, a release will be made. An important point in the spiral model is the project entry point. If the project is a new project then the deposit will enter into their spiral at the innermost level. The first iteration gives the content, model, or paper model. With each increment, the project will be refined, cost the schedule will be adjusted and other releases will be made. If the project is only the n husbands then it will enter into the spiral, in the appropriate entry point, but not at the innermost level.

This spiral model is a realistic approach to the development of big projects. Because software is developed in an evolutionary fashion, the developer and customer can better understand various risks and react properly. Finally, this model is not used as widely as linear sequential or prototyping models.

RAD model

The rapid application development model is an incremental software development process model that emphasizes an extremely short development cycle. The RAD model introduces high speed and combines the speed with a linear sequential model. Here the development of the project in a very short time is achieved by using the concept of component-based construction.

Once the requirements and scope of the project I will understand, the project will be split up into individual components. Is compound will be handled by a separate team. All teams work parallel and the components will be combined to form the final result. RAD model is mainly prepared for projects, which have to be completed in a short period. The only restriction is, the project should be in such a way that it can be split into reasonably equal size individual components, interacting with others to a minimum possible extent.

Business modeling

Information flow among the business functions is modeled to answer the questions.

Data  modeling

The information flow defined in the business modeling phase is refined into a set of data objects that I needed to support the business. The attributes of each object are identified and relationships between objects are defined.

Process modeling

The data objects defined in data modeling are transformed to achieve the information flow necessary to implement a business function. Descriptions are created for adding, deleting, modifying, or retrieving a data object.

Prototyping model

The customer defines a set of objectives for software but does not identify detailed input, processing, or output requirements. A developer may be unsure of the efficiency of an algorithm, the adaptability of an operating system, or the form that human-machine interaction should take.

In the above and many other situations, a prototyping paradigm may offer the best approach.


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