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A requirements specification is a document that outlines the specific needs of a project or system. The requirements specification is important because it serves as the foundation for all future work on the project.

The key components of SRS are: Intro. Description of the purpose of the document, way of business idea implementation, scope of work, overview of a future product. General description of the project, its architect, functions, user characteristics, marketplace, features, and benefits.

The FRD is the first point of translation for the more technical members of the team, which can include design and test engineers, as well as support personnel. Where the PRD describes what should be done from an end-user perspective, the FRD helps to translate that into what should be done from a systems perspective.

For example, if an airline wants a plane that will fly 800 passengers from Los Angeles direct to Tokyo, that is a requirement; when the manufacturer designs an aircraft of certain dimensions powered by four engines of certain horsepower, that is a specification.

The main difference between the two is their focus. A PRD outlines the specific features and functionality that a product must have to meet customer needs and expectations, while a BRD outlines the high-level business objectives and goals that a product must achieve to support the overall business strategy.

Business Requirements Document (BRD) ... Functional Requirements Document (FRD) ... Market Requirements Document (MRD) ... Product Requirements Document (PRD) ... User Interface Requirements Document (UIRD) ... Technical Requirements Document (TRD) ... Quality Requirements Document.

Table of Content Introduction. General description. Functional Requirements. Interface Requirements. Performance Requirements. Design Constraints. Non-Functional Attributes. Preliminary Schedule and Budget.