Software development life cycles, DOT NET Programming

Explain different software development life cycles.

The System Development Life Cycle (SDLC) is the overall process of developing information systems through multi stage process systems from investigation of initial requirements through analysis, design, implementation & maintenance. Those days are gone when one COBOL programmer used to analyze, test and implement software systems. The Systems have become complex, a huge team members are involved, users, architects, analyst, programmers, testers etc. To manage these numbers of SDLC models have been created.

Following are the popular models which are listed below:-

  • Waterfall Model.
  • Spiral Model.
  • Build and Fix model.
  • Rapid prototyping Model.
  • Incremental Model.

Water Fall Model:

This Water Fall Model is the oldest model. It has sequence of stages; output of one stage becomes the input of the other.

The following stages in the Waterfall model are as follows:-

1) System Requirement: - The System Requirement is the initial stage of the project where end user requirements are gathered and documented.

2) System Design: - In the System Design stage detail requirements, business rules, screen layout, process diagram, pseudo code and other documentations are prepared. This is the first step in the technical phase.

3) Implementation: - Depending on the design document the actual code is written here.

4) Integration and Testing: - All the pieces are brought together and tested. The Bugs are removed in this phase.

5) Acceptance, Installation and Deployment: - This is the final stage where software is put in production and runs actual business.

6) Maintenance: - This is the least glamorous phase which runs forever. The Code Changes, addition, correction etc are completed in this phase.

The Waterfall is suited for low risk in the areas of User Interface and performance requirements, but high risk in budget and schedule predictability and control. The Waterfall assumes that all requirements can be specified in advance. But unfortunately requirement grows & changes through various stages, so it requires feedback from one stage to another.

Spiral Model:

The Spiral Model eliminates the drawback of waterfall model, by providing emphasis to go back and repeat earlier stages a number of times as project progresses. On wider level it is a series of short waterfall cycles, each one producing an early prototype representing a part of the entire project. It also helps in demonstrating a Proof of Concept at early software life cycle.

Build and Fix Model:

This is the way free-lancers work Write some code & keep modifying it until the customer is happy. This approach can be quite risky and dangerous.

Rapid Prototyping Model:

This model is also known as Rapid Application Development. The first emphasis is on creating prototype which looks and acts like the desired product. The Prototype can be created by using tools that is different from those used for final product. Once the prototype is approved, its discarded & real software development is started from the scratch. The main problem with this model is that sometimes the prototype moves ahead to become the final live product that can be bad from design point of view. It is a very effective model but can have higher costing than other models as you need programmers during the initial phase of the software cycle.

Incremental Model:

In the Incremental model we divide products into builds, where parts of product are created and tested separately. Here errors are found in the requirement phase itself, user feedback is taken for every stage and code is tested after it is written.

Posted Date: 9/25/2012 1:18:49 AM | Location : United States







Related Discussions:- Software development life cycles, Assignment Help, Ask Question on Software development life cycles, Get Answer, Expert's Help, Software development life cycles Discussions

Write discussion on Software development life cycles
Your posts are moderated
Related Questions
What is DISCO? DISCO is a method developed by Microsoft to publish and discover Web services. It discovers URLs of all XML Web services located on a Web server and develops a

Why does an organization need to manage the workloads? The workload can be explained as an independent service or a set of code that can be implemented. It can be everything f

Improve an existing web application and design (ASP C# Azure Project Description: I want an experience programmer to take my Proof of Concept web app to a professional level.

What is a runtime engine? A runtime engine of WF gives the basic functionality to execute and manage the workflow lifetime. It runs within the host process and is responsible f

I need to develop a new website. Previous site was not good and I need better one with not only static but using also more details . Skills required: .NET, MySQL, C# Programm

What is CodeDom The "CodeDom" is an object model that represents actually a source code. It is designed for language independent - once you create a "CodeDom" hierarchy for a p

Explain Interface? An interface is not a class. It is an entity that is explained by the word Interface. An interface has no implementation; it only has the signature or in oth


What are basic methods of Data adapter? The three most commonly used methods of Dataadapter are as follows:- 1)Fill :- It Executes the SelectCommand to fill the DataSet ob

What is the meaning of object pooling? Object pooling is a method of storing a pool (group) of objects in memory that can be reused later as needed. Whenever, a new object is n