Key Takeaways
"PRDs are waterfall thinking." We hear this constantly from teams who've replaced structured requirements with vague Jira tickets and Slack conversations — then wonder why their engineers build the wrong thing, their stakeholders are surprised by the output, and their launches miss the mark. The PRD debate isn't about methodology. It's about whether your team has a shared, written understanding of what they're building and why.
At Boundev, we place product managers and dedicated engineering teams into companies building digital products — and the single most common dysfunction we see is the absence of clear requirements. Not 100-page specifications. Not rigid waterfall documents. Just a clear, living document that aligns everyone on scope, priorities, and success metrics. That's what a modern PRD provides.
The Real Problem: It's Not the PRD — It's How You Use It
The anti-PRD argument conflates the document with its misuse. Waterfall teams treated PRDs as immutable specifications that couldn't change after sign-off. That approach fails. But the solution isn't abolishing requirements — it's treating the PRD as what it should have been all along: a living document that evolves with the product.
How PRDs Fail (The Waterfall Trap):
How PRDs Work (The Living Document):
What a Modern PRD Must Answer
Every effective PRD answers five questions. If your requirements document — whatever you call it — doesn't clearly answer all five, your team is operating on assumptions. Assumptions ship bugs.
What Are We Building?
Features, user stories, and acceptance criteria that define the product's functionality. This isn't a feature wish list — it's a prioritized set of capabilities with clear definitions of done.
Why Are We Building It?
The business case, market context, and user research that justify the investment. Engineers who understand the "why" make better technical decisions and catch requirement gaps early.
What Are We NOT Building?
Explicit out-of-scope definitions prevent scope creep — the single most destructive force in product development. If it's not in the PRD's "not building" section, someone will assume it's in scope.
What Are the Priorities?
Not all features are equal. Without explicit prioritization, engineering teams make their own priority calls — usually based on technical interest, not business value.
How Will We Measure Success?
If you can't measure it, you can't know if you built the right thing. Success metrics close the feedback loop between requirements and outcomes.
Need Product Managers and Engineers Who Ship?
Boundev places pre-vetted product managers, tech leads, and full-stack engineers who bring structured product development practices to your team. Access senior talent through staff augmentation in 7–14 days.
Talk to Our TeamThe PRD as a Living Document: How to Keep It Useful
A PRD that doesn't evolve is already dead. The key operational challenge isn't writing the PRD — it's maintaining it as a living artifact that reflects reality, not the assumptions you had three months ago.
PRD Anatomy: What to Include (and What to Leave Out)
A modern PRD doesn't need to be a 100-page document. It needs to be comprehensive enough to prevent misalignment and concise enough that people actually read it. Here's the section-by-section breakdown.
Product Overview—problem statement, target audience, strategic alignment, and business case in one page.
User Personas—detailed profiles with pain points, motivations, and context of use.
Features and User Stories—MoSCoW-prioritized capabilities with acceptance criteria per story.
User Flows and Wireframes—visual depictions of key interactions and screen progressions.
Out-of-Scope—explicit list of what is NOT being built in this release with rationale.
Technical Constraints—platform requirements, integrations, performance benchmarks.
Success Metrics—KPIs, release criteria, and instrumentation plan for measuring outcomes.
Risks and Assumptions—documented unknowns, dependencies, and mitigation strategies.
What to Leave Out: Implementation details. The PRD defines what and why. Engineers decide how. If your PRD specifies database schemas, API endpoint structures, or technology choices, you're constraining engineering judgment and creating a document that requires constant technical updates. The PRD describes the destination. The engineering team chooses the route.
Who Owns the PRD? (Everyone, with Clear Roles)
The most effective PRDs are collaboratively created but clearly owned. Each stakeholder contributes specific expertise, and the product manager synthesizes it into a coherent vision.
Acceptance Criteria: The Bridge Between Requirements and Code
Vague requirements produce vague implementations. Acceptance criteria eliminate ambiguity by defining exactly what "done" means for every user story — in a format that engineers can directly translate into tests.
GGiven/When/Then (Gherkin Format)
Best for complex scenarios with multiple conditions. Each criterion specifies a precondition (Given), an action (When), and an expected result (Then). This format maps directly to automated test frameworks like Cucumber.
CChecklist Format
Best for simpler features. A flat list of conditions that must be true for the story to be complete: "User can sort by date," "Pagination shows 25 items per page," "Empty state shows illustration + CTA."
RRules-Based (If/Then)
Best for business logic and conditional behaviors: "If the user has no payment method on file, then show the 'Add Payment' modal before allowing checkout." Useful for integrations and state-dependent features.
Boundev's Perspective: We've seen product teams spend weeks debating requirements in meetings, only to produce two-sentence Jira tickets that engineers interpret differently. The fix isn't more meetings — it's better acceptance criteria. When we place engineers through software development services, we ensure they work within PRD-driven workflows where every story has measurable, testable acceptance criteria before entering a sprint.
FAQ
What is a Product Requirements Document (PRD)?
A PRD is a document that defines what a digital product should do, who it's for, why it matters, and how success will be measured. It serves as the single source of truth for product scope, priorities, and requirements — aligning product managers, engineers, designers, and stakeholders around a shared understanding. Modern PRDs are living documents that evolve throughout development, not static waterfall specifications. They typically include product overview, user personas, prioritized features with user stories and acceptance criteria, user flows, out-of-scope definitions, technical constraints, success metrics, and risk documentation.
Are PRDs still relevant in agile development?
Yes, but the format has evolved. In agile environments, PRDs serve as strategic compasses rather than prescriptive blueprints. They provide the big-picture context — what we're building, why, and what success looks like — while user stories and acceptance criteria break those requirements into sprint-sized work. The key difference from waterfall PRDs: agile PRDs are continuously refined with new learnings, don't require formal approval chains for updates, and define the "what" and "why" while leaving the "how" to engineering. Teams proficient in Scrum, Kanban, or XP use PRDs to maintain alignment while staying responsive to feedback.
What should a PRD include vs exclude?
Include: product overview, problem statement, target personas, prioritized features with user stories and acceptance criteria, user flows and wireframes, out-of-scope definitions, technical constraints (platform, performance), success metrics and KPIs, risks and assumptions, and release criteria. Exclude: implementation details like database schemas, API structures, or technology stack decisions. The PRD defines the destination; engineers choose the route. Including implementation details constrains engineering judgment, creates unnecessary update overhead, and conflates product requirements with technical design — which should be documented separately.
How do you write good acceptance criteria?
Good acceptance criteria are specific, measurable, and testable. Use the Given/When/Then (Gherkin) format for complex scenarios: "Given a user has items in their cart, When they click checkout without a payment method, Then the app displays the Add Payment modal." Use checklist format for simpler features: a flat list of conditions that must be true. Use rules-based (If/Then) format for business logic and conditional behaviors. Each user story should have acceptance criteria that cover the expected happy path, key edge cases, and error states. The test: if a developer and QA engineer read the criteria independently, they should reach the same conclusion about what "done" means.
Who should be involved in creating a PRD?
PRDs are most effective when created collaboratively. The product manager owns and maintains the document, synthesizing inputs from all stakeholders. Engineering leads review feasibility and identify technical constraints. UX designers provide user flows, wireframes, and interaction specifications. QA engineers define testable acceptance criteria and edge cases. Business stakeholders validate strategic alignment and success metrics. Customer support teams flag known user pain points. The key principle: involve stakeholders early to ensure shared vision, gather diverse perspectives, and speed up the alignment process — but keep the PM as the single owner who resolves conflicts and maintains coherence.