Approaches to improve the quality of programs

 Approach to improving the quality of the program

"The struggle for quality programs can be done in two ways.  With a high probability we can hope that there will be a software system with good quality.

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The second way is not so simple, but allows you to receive high-quality software products and when this condition fails to comply with - not enough good programmers, clarity in shipping problems, etc. This path requires a standardization development process: to introduce uniform requirements for the work stages, documentation, organizing routine meetings, to check the code and so on. One of the first progress on the front is the introduction of the life cycle concept of software systems that clearly identify the need to handle many problems, which without it you cannot rely on the success of the software project.

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Need analysis;

Design (Introduction and Details);

coding and debugging (programming);

Testing;

Operation and maintenance.

Standard living cycle schemes with clear regulations about the necessary work and relevant documentation lists are the basis of what is called "waterfalls" or cascade models. The waterfall model implies a strict partition from the software development process into a stage, with the transition from one phase to another made only after being completely completed in the previous stage. Each stage ends with a complete release documentation, enough to ensure that development can be extended to another team. The waterfall model becomes dominant in the process of developing the Ministry of Defense Standards. Many are willing or not, even deviating from this model, generally agreed with reasonable and useful.

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The waterfall model is needed accurately and fully articulates all requirements, changes in requirements may only after the completion of all work. The waterfall model does not answer the question of what must be done when the requirements change or change the understanding of these requirements directly during development.

In the late 80s it was proposed by what was called a spiral model was developed and tested in practice, repetitive and incremental development methods (recurrent and incremental development, IID). In the Spiral model takes into account the problem of the waterfall model. The main focus of the spiral model is done in the iterative process. Experiments described using IID with a length of iterations for only half a day. Each iteration ends with the issuance of the new software version. In each version of the refined requirement (and may change) for the target system and the steps taken to ensure that it meets new requirements. In general, a rational integrated process (RUP) also follows this model.

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Will it solve quality problems? Only to a certain extent.

The problem of improving software quality in general and the quality of software testing attracts more attention, at universities introducing special courses about software testing and quality assurance, preparing special skills in software testing and quality assurance engineers. However, there is still a cost error a.s. Only from 20 to 60 billion dollars every year. With around 60% of losses borne by end users. The situation where consumers are forced to fly using goods.

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However, the situation is not desperate. A study conducted by the National Institute of Standards and Technology, indicates that the size of losses associated with failure in software, you can reduce about one third, if you make extra efforts into software testing infrastructure, especially in software development. Testing tool.

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