The program development life cycle defines seven phases/steps that each program goes through. For each phase, a certain set of tasks is defined.
Phase I: Requirements Analysis
The first stage in program development is understanding the current problem and analyzing the requirements of the client. This phase requires a thorough discussion with senior client members. It is one of the most important stages and forms the base of the solution to be built.
A feasibility study is done to understand the finances involved, the technical aspects, the economical and the operational areas. The goal is an ideal solution with high productivity output and minimum risks.
Once the analysis and expectations are defined, a detailed software requirements document (SRS) is prepared. It consists of all the requirements of the project as per the clientâ€™s expectations. This document becomes the base of all developments in the program. This is then approved by the client before the next phase begins.
Phase II: Design
In this phase, the software design document (SDD) or design document specification (DDS) is prepared as per the SRD. Here, the overall system architecture is depicted, defining the languages used, the cloud servers, the databases, etc.
The names and brief descriptions, along with the functionality of each module, is described here. Database elements along with their key elements, interface relationships and dependency between the modules are defined.
At this point, the pseudo code and algorithms,along with flow charts and other important hierarchical structures, are designed to make the program development more efficient.
The DDS acts as an input to the next phase.
Phase III: Coding
This is the phase where the actual programming begins. The coding of the product begins at this step. The high-level design document is now translated into modules, code functions and divided amongst different developers.
At this step, compilers, interpreters and debugging tools are used to implement the code. This phase is the longest one of the program development life cycle as it is the most crucial phase. All coding guidelines defined by the organization must be followed.
Phase IV: Testing
The product developed in the third phase is used as an input to this phase. A group of testers test the product developed by the program developing team.
All defects/bugs in the product are reported, tracked, fixed and tested until the product/software, as per the SRS document, run flawlessly.
The testing phase is a continuous process of identifying the bugs and logical errors in the system until the expected quality is not attained.
Phase V: Documentation
Once the testing process is completed, the documentation process starts. The flowcharts, algorithms and structure charts developed during the design phase become a part of the documentation.
In this phase, the overview of the program is written in a manual. That manual also includes the programâ€™s functionality, detailed explanation, references and other important details.
Phase VI: Deployment
The software, once testing is complete, is the final product. The final deployment process starts at this point. The project manager deploys the product live for real-time use by the client.
In the real-time environment, user acceptance testing (UAT) is done. The product is made available only to a segment of users to ensure that it is functioning as expected. Based on feedback, the final product is made available to all its real-time users.
Phase VII: Maintenance
When the program is live, in active use, the focus shifts away from development to maintenance. The developers /maintenance team should ensure that the product works at its full potential and that the user faces no difficulties.
Any upgrades/enhancement become part of this phase.
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