Software development is the process of computer programming, documenting, testing, and bug fixing involved in creating and maintaining applications and frameworks resulting in a software product.
Software development is a process of writing and maintaining the source code, but in a broader sense it includes all that is involved between the conception of the desired software through to the final manifestation of the software, sometimes in a planned and structured process. Therefore, software development may include research, new development, prototyping, modification, reuse, re-engineering, maintenance, or any other activities that result in software products.
Software can be developed for a variety of purposes, the three most common being to meet specific needs of a specific client/business (the case with custom software), to
meet a perceived need of some set of potential users (the case with commercial and open source software), or for personal use (e.g. a scientist may write software to
automate a mundane task ) . Embedded software development, that is , the development of embedded software such as used for controlling consumer
products, requires the development process to be integrated with the development of the controlled physical product . System software underlies applications and the programming process itself, and is often developed separately.
The need for better quality control of the software development process has given rise to the discipline of software engineering, which aims to apply the systematic approach
exemplified in the engineering paradigm to the process of software development.
There are many approaches to software project management, known as software development life cycle models, methodologies, processes, or models.
The waterfall model is a traditional version, contrasted with the more recent innovation of agile software development.
A software development process (also known as a software development methodology, model, or life cycle) is a framework that is used to structure, plan, and control the process of developing information systems. A wide variety of such frameworks have evolved over the years, each with its own recognized strengths and weaknesses. There are several different approaches to software development: some take a more structured, engineering-based approach to developing business solutions, whereas others may take a more incremental approach, where software evolves as it is developed piece-by-piece.
One system development methodology is not necessarily suitable for use by all projects. Each of the available methodologies is best suited to specific kinds of projects, based on various technical, organizational, project and team considerations.
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Most methodologies share some combination of the following stages of software development:
Analyzing the problem
Gathering requirements for the proposed business solution
Devising a plan or design for the software-based solution Implementation (coding) of the software
Testing the software
Maintenance and bug fixing
These stages are often referred to collectively as the software development lifecycle, or SDLC. Different approaches to software development may carry out these stages in
different orders, or devote more or less time to different stages. The level of detail of the documentation produced at each stage of software development may also vary.
These stages may also be carried out in turn (a “waterfall” based approach), or they may be repeated over various cycles or iterations (a more "extreme" approach). The more extreme
approach usually involves less time spent on planning and documentation, and more time spent on coding and development of automated tests. More “extreme” approaches
also promote continuous testing throughout the development lifecycle, as well as having a working (or bug-free) product at all times. More structured or “waterfall”
based approaches attempt to assess the majority of risks and develop a detailed plan for the software before implementation (coding) begins, and avoid significant design
changes and re-coding in later stages of the software development life cycle planning.
There are significant advantages and disadvantages to the various methodologies, and the best approach to solving a problem using software will often depend on the
type of problem. If the problem is well understood and a solution can be effectively planned out ahead of time, the more "waterfall" based approach may work the best.
If, on the other hand, the problem is unique (at least to the development team) and the structure of the software solution cannot be easily envisioned, then a more
"extreme" incremental approach may work best.