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A functional requirement defines a system or its component. A non-functional requirement defines the quality attribute of a software system.

How to Write a Business Requirement Document Start with your executive summary. Communicate business objectives. Explain the project's background and why it's needed. Set your scope of work. Define the project's functionality requirements. Identify your key stakeholders. Communicate project constraints. Set a schedule.

A functional requirement is a statement of what a product (system, subsystem, device, or software program) must do. Example: The control system shall prevent engine overspeed.

What is a business requirements document (BRD)? A business requirements document is a report detailing everything a new project requires for success. This document outlines project objectives, what's expected throughout the project lifecycle, and what's required to accomplish the project.

Business requirements explain the ?why? and ?what? of a project, and the functional requirements explain the ?how? of the project. The only difference between a BRD and an FRD is that one describes the high-level business needs while the other describes the functions required to fulfil the business need.

A business requirements document (BRD) template provides a framework to offer stakeholders the logistical details of a proposed project. A BRD template includes project scope, business drivers, proposed process, and functional requirements to demonstrate your project's sound footing prior to development.

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.