How to Write a Business Requirements Document

BRD vs PRD vs FRD: Which Document Do You Need?

A Business Requirements Document (BRD) captures what the business needs from a project — the goals, scope, constraints, and success criteria from a business perspective. It is written for stakeholders, sponsors, and business analysts.

A Product Requirements Document (PRD) translates business needs into product specifications — features, user flows, acceptance criteria, and technical constraints. It is written for engineering, design, and QA teams.

A Functional Requirements Document (FRD) goes even deeper, specifying exactly how each feature should behave at the system level — inputs, outputs, error handling, and integration points. It is the most technical of the three and is primarily for developers.

In practice, many organizations combine these into one or two documents. Startups often skip the BRD and write a PRD that covers both business and product requirements. Enterprises with formal governance processes typically require all three. The key is matching the documentation level to your organization’s decision-making process.

Regardless of which documents you create, store them together in a workspace so all stakeholders can find the right level of detail for their needs.

How to Gather Requirements Effectively

Start with stakeholder interviews. Meet with every person who will be affected by the project — executives who fund it, managers who oversee it, and end users who will use the result. Ask open-ended questions: What problem are we solving? What does success look like? What happens if we do nothing?

Supplement interviews with workshops where cross-functional teams collaborate on requirements in real time. Workshops surface disagreements early — it is far cheaper to resolve conflicting requirements in a meeting room than during development.

Observation is an underused technique. Watch end users perform the tasks your project aims to improve. You will discover needs they cannot articulate because they have adapted to workarounds and no longer recognize them as problems.

Document every requirement with a clear ‘who needs this and why.’ Requirements without a named stakeholder and a business justification tend to be solutions in disguise — someone assuming they know what to build instead of defining what needs to be achieved.

Prioritize requirements using MoSCoW (Must have, Should have, Could have, Won’t have this time) or a similar framework. Not all requirements are equal — separating must-haves from nice-to-haves prevents scope creep and focuses the team on what actually matters.

Common BRD Mistakes

Vague requirements are the most expensive mistake. ‘The system should be fast’ is not a requirement. ‘The dashboard must load in under 3 seconds for datasets up to 50,000 rows’ is a requirement. Every line in your BRD should be specific enough to test.

Another frequent error is missing acceptance criteria. For each requirement, define how you will know it is met. Without acceptance criteria, development never ends — stakeholders keep requesting changes because ‘done’ was never defined.

Scope confusion happens when the BRD tries to cover the entire project lifecycle instead of a specific phase. If your project has multiple phases, write separate BRDs for each one. A single document covering 18 months of work becomes unmanageable and outdated before the first phase is complete.

Finally, avoid writing the BRD in isolation. Requirements gathered by one person in a room reflect one person’s understanding. Validate requirements with at least three stakeholders before treating them as final. The BRD should be a living document that evolves through collaboration, not a decree handed down from above.

Everything you need to write a successful business requirements document

​When kicking off a project, it’s imperative that all project stakeholders understand the expected outcomes of the partnership. That’s where a business requirements document (BRD) comes in handy. Generally, a BRD is used to detail a business’s needs when seeking a new technology provider, consultant, or outside vendor.

The project requirements document template helps your team details a project and outline the business objectives you expect to achieve. Explain functional requirements, scope, and both your business and customer expectations related to the project in detail and include customer expectations, detailed technical and experience requirements, roadblocks, questions, and comments.

• Concisely and visually describe the problems the project is trying to solve and the required outcomes needed to deliver value.
• Gain agreement with project stakeholders and set measurable business objectives.
• Establish a foundation to communicate solutions and expected deliverables and outcomes to satisfy the customer’s and business needs.

With Xtensio, you can easily create business requirements documents tailored to your individual projects and needs. Loop in colleagues, clients, and key stakeholders to create and iterate on your BRD. You can work hand-in-hand with colleagues on a live doc, leave feedback, and share a link so everyone has the information they need to complete your projects.

1. Create your business requirements document header and outline the project overview

Every business project is unique depending on its opportunity, requirements, budget, timeline, etc. But the basic structure of ​BRD will essentially be the same regardless of your project, goals, and requirements. Introduce your business requirements document with your company name and logo, add the project name, the name of the person who created the requirements document, and the date. You can also update the folio color scheme and background to match your company branding.

Next, include an executive summary that summarizes the project, its requirements, and expectations for your overall business goals.

QUICK TIP: Once you set up your header section, you can save a custom template to easily repurpose other requirements docs.

2. Outline the project objective and write your needs statement

Your project objective should describe the desired results of this project, which often include tangible deliverables and high-level KPIs. Think of SMART goals here:

• Specific: Who? What? Where? Why? When?
• Measurable: What are the metrics? Any numbers or percentages to reach?
• Achievable: Do you have the resources and skills to reach the goal you are setting?
• Realistic: Does it match your organization’s overall goals?
• Timely: When will you finalize this project?

It’s a good idea to explain why you’re tackling this project in your needs statement. Explain why the project is needed for the business and how the project will meet these needs. It should present facts and evidence to support the need for the proposed project.

3. Define the project scope

The project scope draws the boundaries of the project and helps managers decide what is included in the project and what isn’t. Having a clear scope helps keep the team aligned and avoids unnecessary wastage of resources. With a clear project scope, you’ll be able to better describe your need and make stakeholders understand the project details, tasks, and deliverables.

Summarize the business requirements for this project. What should be included in the scope and what should not?

4. Detail functional and non-functional requirements

All project functionalities or special requests need to be included in your BRD. Talk to all internal stakeholders and understand what needs to be built and what is required to build it.

Detail the functional requirements of the project and corresponding features including diagrams, charts, and timelines. This could be personnel requirements, budget, and other key resources you’ll need to implement the project. Also include non-functional requirements, such as processing time, concurrent users, availability, etc. These criteria will be used to assess the system’s operation, rather than specific behaviors.

5. Highlight the project schedule, timeline, and deadlines

Outline a project timeline to ensure that all stakeholders are aware of the deadline and important milestones along the way. Having a schedule in place helps you gain credibility with vendors, clients, and contractors, while also keeping your own team accountable. Make sure to account for any unforeseen challenges or roadblocks your team might face.

What is the final deadline? What is the timeline for delivering specific requirements? Outline key milestones, including tasks and deliverables for each.

6. Identify risks and include a glossary of terms

Every project has inherent risks that may cause delays or even failure of a project. Outline the risks to show you know what they are, and also identify ways in which you would mitigate those risks. If needed, you should also add a glossary of terms used in the business requirements document to clarify any questions external stakeholders might have. These could be terms that are unique to the organization, the technology being used in the project, or the standards in use.

Share your business requirements document as a link, monitor, evaluate & iterate

When you’ve finished creating your BRD with Xtensio’s editor, you can send the live link to share it as a responsive webpage (and add password protection), export a PDF or present it as a slideshow in a meeting – you can continuously optimize with new learnings. The business requirements document template is adaptable just like other Xtensio tools, it can and should be repurposed, revisited, and revised regularly.

Written by

Alper Cakir is the founder and CEO of Xtensio, the living deliverables workspace for teams that create, deliver, and reuse professional work, a staple tool for businesses globally. He boasts over 17 years in the tech industry with expertise in UX/UI design, product management, and innovative business strategy. His passion for design led him to work with major clients like CBS Interactive, NBC Universal, and Toyota. Before Xtensio, he co-founded Fake Crow in Los Angeles, known for its innovative UX/UI approach. Alper studied music theory and jazz composition at Istanbul Bilgi University and guitar at Musicians Institute in London. Known for his hands-on approach, his philosophy is to simplify processes, cut through bureaucratic red tape, and help teams create work that’s ready to send and stays alive as projects evolve.

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