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When detailing requirements in a BRD, requirements should focus on answering "WHAT" the client wants to include in the functionality of the delivered solution. The Functional Specifications Document (FSD) should answer the "HOW" that functionality is designed, programmed, and delivered.

Definition: A business requirements document describes the business solution for a project (i.e., what a new or updated product, service or result should do), including the user's needs and expectations, the purpose behind this solution, and any high-level constraints that could impact a successful deployment.

BRD or a BRS includes the high-level business requirement of a system to be developed in layman language. SRS document includes the functional and non-functional requirements and Use Cases. FRD document consists of detailed requirements in technical terms and technical diagrams like UML, Data Flow, etc.

The Business Requirement Document (BRD) describes the high-level business needs whereas the Functional Requirement Document (FRD) outlines the functions required to fulfill the business need. BRD answers the question what the business wants to do whereas the FRD gives an answer to how should it be done.

Functional requirement document is mainly technical document or a high level design what project managers prepare. BRD to FRD can be acheived by using 3 Dimensional Requirement Matrix tool over lines of Business Wise, Function Wise and Technical Wise.

A BRD deals with what an organization hopes to achieve through a vendor partnership. On the other hand, a functional requirements document (FRD) deals with how they expect to achieve it. For example, imagine an organization that's recently purchased an applicant tracking system to help with their recruiting efforts.

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.