The quality of a software development effort is improved with the use of carefully selected process techniques, and this process is called software engineering. This is based on the premise that methodical approach to software development often results in fewer imperfections, thus, providing better value and shorter delivery time of the software application. The software development methodology (SDM), also known as the system development life cycle (SDLC) is the documentation of the processes, policies and procedures used in software engineering.
Many software teams face the challenge of selecting and following a methodology wisely to provide sufficient disciplines. Design methodologies are also critical in delivering quality services, phlebotomy training schools and products by avoiding time wastage, resources, demoralizing developers and many other troubles.
Steps followed in the system development cycle possess risks, but there are several techniques that the development team can follow to improve the process and create a high-quality output. The following are the major steps that software developers usually encounter:
- Project charter and business case
- Documentation of user, system and functional requirements
- Definition of the business process and requirements
- System decomposition
- Top-level architecture, system design and technical approach
- Generation of test data
- Coding, test planning and unit test
- Integration of the system and testing
- Training and user support
- Implementation
- System upgrades
The Waterfall Methodology
The simplest rendition of managing all projects through segmentation into hierarchy such as stages, phases, activities, steps and tasks in system development projects is called the “waterfall methodology”. This presumes the system requirement has already been identified, defined and used exhaustively. Work is done in phases or stages and the reviews are done between the stages. This gives an orderly sequence of the steps in the project and helps ensure the proper documentation and reviews of the designs. Though many people view the waterfall methodology as slow, it illustrates a number of good principles of the cycle development.
The Spiral Methodology
When there is a need for a reduced time, the waterfall methodology is unsuitable. The spiral methodology is an evolution from the method where different steps are done for multiple handoffs or deliveries. It takes advantage from the fact that projects work best when they are iterative and incremental. The spiral methodology also shows the relationship among tasks with increased parallelism, speedy prototyping, and concurrency in design activities. This should still be planned methodically by identifying tasks and deliverables for each stage or step.