Difference Between BRS and FRS

The Business Requirement Specification is known as “BRS” and Functional Requirement Specification is known as “FRS”. In general, the use of these documents is determined by the type of organization & firm, as well as their standards & how they follow processes. 


The main difference between BRS and FRS is that a BRS document is written at the start of a project to show the strategy to meet the client’s needs on a more basic level. And FRS is the most comprehensive document created by developers and testers, including all software components and expected interactions, as well as business, compliance, and security requirements.

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“A Business Requirement Specification (BRS) is a document that focuses on the business side of things since it contains the specifics of a project’s business solution.” In other words, a BRS is a statement made to reconcile the discrepancy between the balances in the cash book’s bank column and the passbook on a certain date.

“A functional requirement specification, or FRS, is a document that lists all of the tasks that a piece of software or a product must accomplish. In actuality, it’s a step-by-step procedure for performing all of the actions necessary to build a product from beginning to conclusion. An FRS describes how various software components will react during user interaction in detail.”

Comparison Table Between BRS & FRS

Parameters of ComparisonBRSFRS
What does it involve? In layman’s terms, BRS contains the high-level business requirements of a system to be created. The FRS document contains extensive technical requirements as well as technical diagrams such as UML, Data Flow, and so on.
What does it answer? BRS responds to the WHY question, i.e. why are the requirements being prepared? FRS is concerned with the HOW, or how the requirements will be carried out.
When it is created? During the project’s analysis phase, a BRS document is prepared. During the project’s analysis phase, a BRS document is prepared. During the project’s planning phase, an FRS document is developed.
Who will be responsible for creating? The business analysts will generate a BRS document. The FRS is prepared collaboratively by the Business Analyst, System Analysts, & Implementation team since it is detailed and technical.
Who will be using it? BRS is designed for business users, stakeholders, and other interested parties. The development team and quality assurance, or testing team, will utilize the FRS document.

What is BRS?

This document is referred to as a high-level document since it contains all of the client’s requirements. Ideally, this document would simply list all of the requirements that should be included in the proposed system. 

BRS contains a list of client-requested features that should be included in the proposed system. Expectations for product performance, important targets, and other business goals that a client wants to achieve with a product are all mentioned in a BRS (Business Requirement Specification). 

BRS generates a report of user connections. This document is typically written at the start of a project to show the strategy for meeting the client’s needs on a more broad level. While the SRS and FRS give a roadmap for developers, a BRS is required from a business standpoint. 

As a result, use cases and illustrations are not provided in this section, allowing the software and functional requirements lists to fill in the gaps. It is a formal document that describes the client’s requirements (written, verbal). It is generated from interactions with clients and their needs. 

Clients often evaluate the final version of the document to ensure that every stage and conclusions are in line with their expectations. 

What is FRS?

FRS (Functional Requirement Specification) is, without a doubt, the most interesting topic for software developers. They can learn an algorithm for the creation of operations there, as well as a detailed explanation of how the program is supposed to work. 

Functions done by individual screens, summaries of workflows performed by the system, and any business or compliance criteria the system must fulfill should all be included in the functional requirement system (FRS). FRS provides needs that have been turned into functionality, as well as information on how these requirements will be implemented as part of a proposed system.

The key area of interest for software experts is the Functional Requirement Specification (FRS). As part of the planned system, the FRS provides requirements that have been turned into the manner they would operate. 

It is the most comprehensive document created by developers and testers, and it covers all software components and expected interactions, as well as business, compliance, and security requirements. An FRS is useful for software testers to learn the situations in which the product is intended to be tested, just as it is for developers to understand what product they are planning to produce.

The System Owner and Quality Assurance should sign the Functional Requirements Specification. If important end-users, developers, or engineers were engaged in the development of the requirements, having them sign and approve the document may be acceptable.

Main Differences Between BRS & FRS

  1. BRD contains ‘high-level’ business needs, whereas FRD/FRS comprises ‘granular’ functional requirements as well as data flow and UML diagrams.
  2. During the project lifetime, the BRS is frequently one of the first few documents prepared. It highlights a company’s high-level aims or requirements that it is attempting to meet through the creation of a service or a product. And the FRS document is written from the point of view of a user, and it explains how the program will behave while interacting with an external user.
  3. BRS is concerned with elements of company requirements, whereas FRS is concerned with customer requirements.
  4. In BRS, we specify exactly what the consumer wants. This is the document that the team follows from beginning to conclusion. But in FRS, we describe the specific features of each page in great detail from beginning to end.
  5. BRS explains the entire account of prerequisites, whereas FRS outlines the sequence of operations to be followed for each individual process.


For each project, both the Business Requirement Specification (BRS) and the Functional Requirement Specification (FRS) are essential. They are not, however, the same document.

The author, audience, substance, and aim of BRS and FRS are the key differences. BABOK is the worldwide acknowledged standard for the profession of business analysis, and BRD is one of the most frequently accepted requirements papers.

 BRS is developed through customer contact and requirements, whereas FRS is derived from BRS.

The FRS is the most thorough and granular of the three documents. 

Finally, it explains ‘How’ the system is required to work in order to meet all of the BRS and SRS standards. FRS’s ultimate purpose is to meet all of the standards outlined in the BRS regulations.


  1. https://journals.sagepub.com/doi/abs/10.3141/1767-18
  2. https://link.springer.com/article/10.1007/s00425-009-1016-1
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