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PRD · Documentation · Product Management · Agile · PTOS

PRD-lite: How to Write a Product Requirements Document That Will Be Read and Used

A detailed guide on creating a 'PRD-lite'—a concise yet comprehensive document that clearly defines 'what we are building and why it matters,' leaving the 'how' to engineers and designers.

PRD-lite: How to Write a Product Requirements Document That Will Be Read and Used

Product Requirements Document (PRD) is often associated with heavy, outdated documentation that no one reads. But in the Agile world, a PRD remains a vitally important tool—not as a bureaucratic formality, but as a contract of understanding. Its purpose is to ensure that the entire team (engineers, designers, QA) builds the same solution, with a common understanding of "what" and "why."

In PTOS, we talk about PRD-lite—a concise yet comprehensive document that focuses on the essence and remains a living artifact, not gathering dust on a shelf.

Why a PRD is Needed (and why it cannot be ignored)

A PRD doesn't replace communication, but it structures it. It helps to:

  • Eliminate ambiguity: Prevents situations where "everyone is in their own world" and builds something different.
  • Make the solution discussable: Clearly defines the problem, expected outcome, constraints, mandatory elements, and success criteria. This allows for arguments about meaning and data, not tastes.
  • Be fast without chaos: The team can autonomously make decisions about "how" (design, architecture), having a clear framework for "what" and "why."

PRD in PTOS: PM decides "what and why," Engineers/Designers "how"

The main idea of Pendo (and PTOS): The PM answers the question "what are we building and why is it important." The task of designers and engineers is to find the optimal "how." A good PRD gives them sufficient context for this, without dictating technical details.

PRD-lite Skeleton (1–2 pages)

This is the minimum that will allow your team to move quickly and cohesively.

  1. Context / Key Project Information:

    • Briefly: what is this product/feature and its place in the overall strategy.
    • Example: "A new notification system for B2B clients that will improve Task Success when working with tasks and reduce churn."

  2. Objective:

    • What specific user behavior should improve? What outcome do we want to achieve?
    • Example: "Increase the percentage of users who return to unfinished tasks after receiving a notification, from 15% to 25%."

  3. Assumptions / Risk Areas:

    • What key hypotheses underlie this change? Where might we be wrong?
    • Example: "We assume that users do not return to tasks due to 'information overload,' not due to lack of motivation."

  4. User Stories / User Journey:

    • Description of key use cases from the user's perspective. Link "what we do" ↔ "how the user will experience it."
    • Example: "As an administrator, I want to receive a notification about an overdue task so that I can react promptly."

  5. Success Metrics + Guardrails + Window:

    • How will we measure success? What metrics should not worsen? In what window do we expect the effect?
    • Example:
      • Success: 10% increase in retention for unfinished tasks.
      • Guardrail: The number of "notification disablements" should not increase.
      • Window: 14 days after Launch.

  6. Scope: In / Out (what is included, what is not):

    • Clear boundaries of what will be done and what will not. This protects against scope creep.
    • Example:
      • In: Email and in-app notifications.
      • Out: SMS or push notifications.

  7. Design Artifacts (links):

    • In PRD-lite, there's no need to describe the interface. Just provide links to prototypes, flows, mockups. This is a "common language" for the team.
    • Example: "[Link to Figma prototype of key screens]", "[Link to User Flow in Miro]".

How Does a PRD Make Sense to "Each Tribe"?

A PRD is a boundary object: a single object that different groups read differently, but it maintains the common identity of the solution.

  • For engineers: The PRD provides the framework of "what" and "why," leaving them freedom in "how."
  • For designers: The PRD provides context and goals so they can create effective solutions.
  • For stakeholders: The PRD explains business value and risks.

How to Make Changes to a PRD?

A PRD is a living document. Any change to objective, scope, metrics, or assumptions must:

  • Lead to a new version of the PRD.
  • Be recorded in the Decision Log: what was decided, when, why.
  • Be supplemented by a Changelog: what changed and what are the implications.

PRD-lite is not about extra work, but about clarity and efficiency. It allows teams to be fast without chaos and create products that users truly need.