Software Development Life Cycle

Software Development Life Cycle is also known as SDLC. It is a procedure to develop software applications.

It consists of different stages or different phases.

1. Requirement Gathering / Collection:- Usually, the customer or client gives the requirement in the form of CRS/BRS and is converted into SRS by BA. BA is Business Analyst which acts like a bridge between the customer and the company.

Business Analyst Should be confident in

• Communication Skills
• Domain Expert
• Convincing Skills
• Technical Skills
• Analyzing Skills

Business Analyst Collects all the information/requirements from the customer and gives it to the development team. That is a requirement Collection

2. Feasibility Study:- In this Phase, BA, HR, Architect, Finance, and PM will discuss all the information needed about the project. 

• BA will explain the requirements.
• HR will think of the required resources.
• Finance will take care of the budget.
• Architects will think about which technology we should use for the project.
• The PM will take care of the final decision and gathers all the data related information to proceed to the next phase or stage.

3. Design:- Once everything is fine, we move forward to the Design phase after the Agreement / Sign off between the customer and company.

In the design phase, we have LLD and HLD. Usually, the design phase is taken care by an architect or senior developer.

• High-Level Design:- It is just like a blueprint. It shows the external architecture of the Application.
• Low-Level Design:- It shows the internal architecture of the Application

Both HLD and LLD are documentation.

4. Coding:- Once the design is done, developers start writing the source code for the application by looking at the design and requirements.

• All developers will be involved in writing the source code. i.e. Senior developers, Junior Developers.
• Developers will write Frontend and Backend Source Code.
• This is done in the Development server. All Developers will be involved in it.

5. Testing:- Once coding is done, developers will give applications to Test Engineers. All Test Engineers will start testing the application UI and find defects.

• If any defects are found in a software application, it again goes back to the developers.
• Developers will fix it again and give it back to the Test Engineer for re-verification.
• Like this, the process continues till the application meets/matches the requirements.
• The Testing will be done in the Testing Server.
• Once everything is completed, we will go for the next phase called Installation/Deployment.

6. Installation/Deployment:- Making the software application available for end users is called “Installation” i.e. Moving the software from the Testing server to the production server (End users will use it).

• It is done by the software company once the testing is completed.
• The customer/Client should approve for installation.
• It can be done by the Installation team/Delivery Team.

7. Maintenance:- Once the software is provided to customers or end users, if they face any problem, support has to be provided, which is called Maintenance.

• Initially, it will be free, Later it will be paid.
• Free service will be provided based on the agreement between the customer and the company.
• During maintenance, defect fixes will be handled and changes will be taken care of.
• Changes can be adding, modifying, and deleting a feature.
• Maintenance always happens once the application is on Production Server.
• It will be done by the development /maintenance team and this is decided by the Customer and Manager.