Introduction of Requirement Analysis
Much has been said about building correct systems that work according to user requirements. However, correct systems can only be built if is known exactly what the user requirement is and what system must do. One of the most important factors in building correct system therefore, is to clearly define what the system must do. There are two major steps to consider. The first step is to agree on a broad conceptual solution. The next step is a detailed analysis of user requirements followed by a system specification. This step is needed to develop a good understanding of the system and its problems.
Initially in the requirements phase there is need to elicit the requirement forms the use. Logically, this is required to establish precisely what the users of the system want. The problem that software engineers have to solve is often immensely complex. Understanding the nature of the problems can be very difficult, especially if the system is new. Consequently it is difficult to establish exactly what the system must do. The descriptions of the services of the services and constraints are the requirements for the system and the process of finding out, analysing, documenting and checking these services and constraints is called, requirement engineering.
Indentifying detailed user requirements is becoming even more important in the complex. System that are now being developed. There are many ways to develop system requirements. One of these, however, is not simply setting down and drawing a model of system or setting user requirements in the privacy of an office. It can only be done by going out and discussing with users that they require of the system and then building the system that satisfy these requirements.
The dominant par t here is the communication between the users and the software developer or engineer. When engineers are dealing with requirements, they are normally referred to as requirements engineers, system analyst or simply analysts, whereas the users are sometimes known as clients or customers. There is of course often difference between a user and the customer. For example an organization will often buy a computer system for its employees.
In the beginnings, the requirement analyst has to identify the client needs by talking to various people in the client organization and understanding their needs. Such type of requirement gathering methods may be used and may they depend on the kind of system being studied. For an example to replace a current manual process, by software, many of the needs can be understood by observing the current practice. But no such methods exist for systems for which manual processes do not exist. For such system the requirement problem is complicated by the fact that the needs and requirement of the system may know the known even to the user they have to be visualized and created. Thus in summary. It is necessary to determine the best way to indentify requirement and then to spend some time studying and observing the system talking to its users and obtaining information in many other ways about how the system works and what is needs of the new system.
Arguably, establishing the requirements in the single most important activity in software development. If we cannot accurately specify what is futile to implement it. Conversely, we could implement the most beautiful software in the world but if it is not what is needed we have failed.
In the engineering sense requirement are used to produce a specification. so this phase translates the ideas in the minds of the clients into a formal document ( the output of the requirement phase) thus the output of this phase is a set of formally specified requirements , which hopefully are complete and consistent,. While the input has none of these properties.
To understand the concept of specification we consider an example of building a bridge. To develop its specification, we should know how much traffic should the bridge carry? How long will be? Etc. It is only when these specification are clearly specified then we can that the finished product, or the bridge is correct that is it is what we wanted.
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