PRD vs BRD: What's the Difference?

What Is a PRD?

A PRD translates the business need into actionable product specifications. It describes what the product must do, how users will interact with it, and how success will be measured. Product managers own this document.

The PRD focuses on the product definition. It takes the business goals from the BRD and converts them into functional requirements, user stories, and acceptance criteria that engineering can build from.

• Executive summary of the product
• Problem statement (from the user's perspective)
• Target users and their pain points
• Functional and non-functional requirements
• User stories with acceptance criteria
• Success metrics and KPIs
• Constraints and dependencies
• Out of scope items
• Risks and mitigation strategies

What Is a BRD?

A BRD captures the high-level business need, the problem to be solved, and the expected business outcomes. It is typically written by business analysts and reviewed by leadership before a project gets funding.

The BRD focuses on the business case. It describes the current state, the gap that needs to be filled, and the return on investment the organization expects.

• Business problem or opportunity
• Current state analysis
• Desired future state
• Business objectives and success criteria
• Scope and constraints at the business level
• Stakeholders and their expectations
• Budget and timeline overview
• Risk assessment from a business perspective

Key Differences

• Purpose: BRD justifies the investment. PRD defines the product.
• Audience: BRD is for executives. PRD is for product, engineering, and design.
• Author: BRD is written by business analysts. PRD by product managers.
• Focus: BRD focuses on business outcomes and ROI. PRD on user needs and specs.
• Timing: BRD comes before project approval. PRD comes after.
• Detail: BRD operates at a strategic level. PRD at a tactical, implementation-ready level.

When to Use Each

Use a PRD when the initiative is approved and you are defining what to build. For smaller projects, a BRD may not be necessary.

Use a BRD when you need executive approval for a new initiative. For new products or major features that require budget approval, a BRD comes first.

Can You Use Both?

Many teams start with a BRD and evolve it into a PRD. The BRD captures the why. The PRD captures the what. Together, they form a complete picture from business justification to product execution.

Here is a typical workflow:

1. Business analyst writes the BRD capturing the problem and expected outcomes.
2. Leadership reviews and approves the BRD, allocating budget.
3. Product manager writes the PRD, translating business requirements into product specs.
4. Engineering, design, and QA use the PRD as their blueprint.

Summary

If you need approval, start with a BRD. If you already have approval and need to define what to build, write a PRD. For small features within an existing product, a PRD alone is usually sufficient.