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Definition of Requirement EngineeringThe process of defining, documentation, and maintenance of requirements in the design process of engineering is called requirements engineering. It provides an apt mechanism to understand the customer’s desires, analysis of needs of the customer, feasibility assessment, negotiations for a reasonable solution, clarity in the specification of the solution, specifications validation, and requirements management. In contrast, the requirements are being transferred to the working system. Hence, this makes requirements engineering an application that is disciplined, having the principles, methods, tools, and notations that are proved, which can describe the intended behavior of the proposed system and the constraints associated with it. The process of requirements engineering happens in five steps. The below figure illustrates the five steps of requirements engineering. Process of Requirements EngineeringThe five steps in the process of requirements engineering are: 1. Feasibility StudyThe main aim of a feasibility study is to create reasons for the development of the software that the users accept, that is flexible enough and open to changes, and abide by the standards chosen for software development and maintenance. There are several types of feasibility. They are: Technical Feasibility: The current technologies are evaluated using technical feasibility, and they are necessary to achieve the requirements of the customer within the given time and budget. Operational Feasibility: The assessment of the range for software in which the required software performs a series of levels to solve the problems in business and the customer’s requirements. Economic Feasibility: If the required software can generate profits in the area of finance is decided by economic feasibility. 2. Elicitation of Requirements and AnalysisThis process is also called requirements gathering. If there are any existing processes available and with the help of customers, requirements gathering is done. Elicitation of requirements is the starting step of requirements analysis. Inconsistencies, omissions, defects, etc., can be identified by analyzing the requirements. Requirements are described in relationship terms to resolve if there are any conflicts. There are a few challenges with respect to the elicitation of requirements and analysis. They are:
3. Specification of Software RequirementsA document consisting of requirements that are collected from various sources like the requirements from customers expressed in an ordinary language and created by the software analyst is called a specification document for software requirements. The analyst understands the customers’ requirements in ordinary language and converts them into a technical language that the development team can easily understand. Several models are used during the process of specification of software requirements like Entity-Relationship diagrams (ER diagrams), data flow diagrams (DFD), data dictionaries, function decomposition diagrams (FDD), etc.
4. Validation of Software RequirementsAfter the development of the specification of requirements, the requirements laid down in the document are validated. There may be requirements from the users that are illegal or which cannot be accomplished, or the experts can misunderstand the needs. The requirements must satisfy the following conditions:
There are several techniques for the validation of requirements. They are:
This includes an analysis of the requirements systematically and manually.
The requirements of the model are checked by using a model that is executable.
The testability is checked for the requirements by the development of tests.
The consistency of the descriptions of requirements is checked. 5. Management of Software RequirementsThe process of managing the requirements that keep changing during the process of requirements engineering and development of the system is called management of software requirement. During the process of software management, there are new requirements with the change in the needs of business, and there is the development of a better understanding of the system. During the process of development, the requirements priority changes from different views. During the process of development, the technical and business environment of the system changes. Advantages of Requirement EngineeringThe advantages of using requirements engineering are:
Recommended ArticlesThis is a guide to Requirement Engineering. Here we also discuss the introduction and process of requirements engineering along with advantages. You may also have a look at the following articles to learn more –
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task definition (informative definition), conceptual stage (cardinal definition), design stage (formative definition), and. implementation stage (manufacturing definition).
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