Among all the models System Development Life Cycle (SDLC) Model is one of the leading models that have been widely accepted. SCLC is also famous as Classic Life Cycle Model or Linear Sequential Model or Waterfall Method.
This model follows some specific phases, which the output of each stage becomes the input for the next phase. These phase can be described in various ways and the steps involves:
This is the first phase in which the in depth analysis of the project is done keeping in mind the various aspects of software development including the cost and benefits. The analysis includes organisational objectives, nature and scope of the project, the concerned problems and other aspects of the project.
Based on the detailed analysis of objectives and problems, alternative solutions can be proposed with the help of idea generation and consulting with the employees, clients, suppliers and consultants. In addition to that, you can also study the strategies of your competitors to come through an alternative. Based on the available data and resources you can go for the best possible alternative i.e. whether to leave the system as it is without any development or alterations or to improve it or develop a new system.
In the next step you need to define the cost to be incurred and the benefits of the project.
Systems analysis, requirements definition:
Now, when it is clear that what has to be done with the project, the next step involves the setting of a specific project goal, which should define the functions and operations to be included in the project for the successful completion of the project. The goal should be based on the analysis of end-user information needs. This phase is also called the feasibility study as it also defines the personnel assignments, costs, project schedule, target dates, required function, behaviour, performance and interfacing.
In this phase, the desired features and operations of the application are defined in detail. This may include architectural framework, screen layouts, business rules, process diagrams, pseudocode and other important documentations. This is the most important phase of the cycle as any mistake in this phase can be very expensive to solve in the later stages of the system. So, special attention is paid in this phase.
This is the code generation phase in which the actual code is written. The design is translated into a machine-readable form for execution during this phase. The work is done by the experts such as compilers, interpreters and debuggers who uses different high-level programming languages such as C, C++, Pascal and Java for generating the codes. Depending upon the requirements and need the right programming language is chosen.
Integration and testing:
Once the coding for the program has been done, all the codes are brought together to a specific testing environment to test the feasibility of the software program. Different methods for testing are available that are used to resolve the bugs and errors committed during the development phase.
Acceptance, installation, deployment:
This is the final step of the software development where the software is made available for production to start the actual business as per the goal.
Once the software is available to the end user for use, it will definitely undergo some changes with time due to various factors. This, is the reason the software should be developed with a vision to accommodate the possible changes during the post implementation period.