BRS vs FRS: Difference and Comparison

The Business Requirements 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. 

Key Takeaways

  1. BRS stands for Body Retention System, while FRS stands for Fuel Retention System.
  2. BRS is used in aircraft and vehicles for safety, while FRS is used in nuclear reactors for efficiency.
  3. BRS is designed to keep occupants safe during an accident, while FRS is designed to prevent the loss of fuel.


The 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.


“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 to reconcile the discrepancy between the cash book’s bank column balances 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

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 list all of the requirements that should be included in the proposed system. 

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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 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 evaluate the document’s final version to ensure that every stage and conclusion is in line with their expectations. 

What is FRS?

FRS (Functional Requirement Specification) is undoubtedly 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 fulfil should all be included in the functional requirement system (FRS).

FRS provides needs that have been turned into functionality and information on how these requirements will be implemented as part of a proposed system.

Software experts’ key area of interest 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. 

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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, data flow, and UML diagrams.
  2. During the project’s 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.

Last Updated : 13 July, 2023

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8 thoughts on “BRS vs FRS: Difference and Comparison”

  1. The distinction between BRS and FRS is not only technical but also strategic, as it addresses the business needs and the operational functionalities of the project, thus ensuring alignment with client requirements.

  2. The main differences outlined between BRS and FRS underscore the importance of formalizing business and functional requirements to achieve project success. Clear documentation is fundamental to effective project management.

  3. The comparison table effectively highlights the different roles and responsibilities of BRS and FRS, emphasizing the ‘why’ and ‘how’ aspects of the project requirements.

  4. It is interesting to note that BRS is designed to cater to the business requirements, whereas FRS is focused on the functional specifications of software components. This ensures a comprehensive approach to meeting project goals.

  5. This detailed explanation of BRS and FRS provides valuable insights into their purposes and applications. The significance of these documents in project development cannot be overlooked.

  6. The distinction between BRS and FRS is crucial, as it determines the focus and scope of the initial documentation and the subsequent detailed specifications for a project.

  7. The detailed descriptions of BRS and FRS help to clarify their respective roles and relevancy to the project life cycle. This understanding is crucial for successful project execution.

  8. BRS and FRS are both essential components in the development of various systems and projects as they provide a structured approach to meeting clients’ needs and achieving project objectives.


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