By Simon Sovič, Senior Product Manager

Most product principles end up in a Notion doc nobody reads. You write them during an off-site, everyone nods, and two weeks later the team is still making decisions based on gut feel and whoever speaks loudest in the room. That is not a principles problem. That is a process problem.

This guide shows you how to write product principles that actually shape decisions, day to day. It works whether you have a full cross-functional team or you are a solo founder managing a product with no engineers yet. You will finish with a set of principles you can test in your next meeting. Estimated time: two to three hours for the drafting phase, then one week of iteration with your team.

What You'll Need

  • A clear understanding of who your product is for and what problem it solves
  • Access to any existing product documentation: vision statements, roadmaps, past decisions
  • A shared document tool (Notion, Google Docs, or anything your team already uses)
  • At least one or two people who work on the product with you, or a clear memory of the decisions you have made so far if you are working alone
  • Roughly two to three hours of focused time for the initial draft

Step 1: Audit the Decisions You Already Make

Before you write a single principle, look at decisions your team has already made. Pull together five to ten product decisions from the last three months. These could be feature prioritization calls, design tradeoffs, scope cuts, or customer requests you said no to.

For each decision, write down the reasoning that was actually used in the room, not what you wish had been said. Look for patterns. If you kept choosing speed over perfection, that is a principle waiting to be named. If you consistently prioritized one customer segment over another, that is another one.

  • Use a simple table: Decision | Reasoning Used | Outcome
  • Include decisions you regret. Those reveal principles you violated, which is just as useful.
  • If you are solo, reconstruct this from memory or from Slack threads, tickets, and emails.

Pro tip:If you cannot find a pattern across at least three decisions, you do not have a principle yet. You have an anecdote. Keep looking.

Step 2: Draft Principles as Trade-Off Statements, Not Values

This is where most teams go wrong. They write principles that sound like company values: "We are customer-obsessed" or "We move fast." These are not principles. They are posters.

A real product principle tells your team what to choose when two good things are in conflict. The format is simple: "We prefer X over Y." That structure forces clarity.

For example:

  • "We prefer shipping something useful to 100 users over shipping something perfect to zero."
  • "We prefer removing a feature over adding a workaround."
  • "We prefer one workflow done well over three workflows done adequately."

Take the patterns you found in Step 1 and draft each one as a trade-off statement. Aim for five to seven principles. Fewer is better. If you have twelve, none of them will stick.

  • Each principle should create a real tension. If everyone agrees with both sides, it is not a principle worth keeping.
  • Write them in plain language. Avoid product jargon. If a new hire on day one cannot understand it, rewrite it.
  • Name the principle with a short label so people can reference it quickly in meetings: "Useful Over Perfect," "Fewer Flows," etc.

Step 3: Pressure-Test Each Principle Against Real Scenarios

A principle is only useful if it survives contact with an actual decision. Take each draft principle and run it through three real scenarios your team has faced or will likely face.

Ask: does this principle give a clear answer? Does the answer feel right? If the principle points in a direction you would not actually follow, either the principle is wrong or the wording is off.

  • Scenario test 1: A customer requests a feature that would benefit them but add complexity for 90% of your users. What does the principle say?
  • Scenario test 2: You are two days from a deadline and a core feature is not polished. What does the principle say?
  • Scenario test 3: Two team members disagree on the scope of a story. Which principle breaks the tie?

If a principle cannot answer at least two of these clearly, cut it or rewrite it.

Warning:Do not fall into the trap of writing principles that always agree with each other. If your principles never conflict with each other, they are not doing the work of prioritization.

Step 4: Get Buy-In Through Co-Creation, Not Announcement

Principles handed down from leadership get ignored. Principles that the team helped shape get used. Even if you wrote the initial draft alone, bring others in before you call them final.

Run a short session, thirty to sixty minutes, where you walk through each principle and ask two questions: "Would this have helped us in a decision we made recently?" and "Is there a case where this principle would lead us somewhere wrong?"

  • Do this with everyone who makes product decisions regularly, not just senior people.
  • If you are a solo founder with no team yet, talk through the principles with an advisor, a peer founder, or even your first customers. Outside eyes catch blind spots.
  • Document objections and revisions in the same doc so the history is visible. This shows the principles were thought through, not just declared.

If you are working through the early founder stage without a co-founder or team, you may find it useful to work through this kind of structured thinking with a mentor. Is Having a Mentor Worth It? 4 Reasons for Founders Covers why that outside perspective matters more than most solo founders expect.

Step 5: Embed Principles Into Your Existing Workflows

Writing the principles is the easy part. The hard part is making them unavoidable. If principles only live in a doc, they will be forgotten by next week.

Here is how to make them stick:

  • Add them to your PRD template.Every product requirements document should reference which principles apply to this feature and how.
  • Use them in retros.After a sprint or a release, ask: did we honor our principles? Where did we compromise and why?
  • Reference them by name in Slack or meetings.When someone raises a debate, say "Principle 3 says we prefer X here." That normalization is what makes principles feel real.
  • Put them in your onboarding materials.A new PM or engineer should read your principles before their first week is out.
  • Review them quarterly.Principles are not permanent. Your product context changes. Set a calendar reminder to revisit them every three months and retire any that no longer reflect how you actually work.

If you are in early-stage product work without an engineering team, you can still apply principles to your design decisions, your customer conversations, and your prioritization calls. How to Onboard as a New Product Manager at a Startup Has more on how to build structure when the org chart is still blank.

Step 6: Measure Whether the Principles Are Working

You cannot improve what you do not measure. After one month of using your principles, run a quick check.

Ask your team these three questions anonymously or in a retro:

  • Can you name two of our product principles without looking them up?
  • Did you reference a principle in the last two weeks when making a decision?
  • Is there a recent decision where the principles were unclear or unhelpful?

If fewer than half your team can name two principles without looking, they are not embedded yet. Go back to Step 5 and increase the touchpoints. If principles were unhelpful in a specific situation, revisit the wording using the trade-off format from Step 2.

Keeping yourself accountable to this kind of structured follow-through is easier when you have a system for it. Best Accountability Tools for Solopreneurs in 2026 Covers tools that help founders stay consistent without relying on willpower alone.

Common Mistakes to Avoid

  • Writing principles that are actually values."Be customer-first" is not a principle. It does not tell anyone what to do when two customer needs conflict.
  • Having too many principles.More than seven and people stop remembering them. Cut ruthlessly.
  • Treating principles as permanent.A principle written for a 10-person team may not apply at 50 people. Review them regularly.
  • Announcing principles without buy-in.People follow principles they helped create. They ignore ones handed to them.
  • Skipping the pressure test.Principles that have not been tested against real decisions will fail in the moment that matters most.
  • Writing them in abstract language.Vague principles create interpretation disputes. Write them plainly and specifically.

Frequently Asked Questions

How many product principles should a team have?

Five to seven is the practical limit for most teams. Fewer than five often means you have not thought through the real tensions in your product. More than seven means people will stop remembering them. If you have ten or more, look for overlap and combine where you can.

What is the difference between product principles and product values?

Values describe what you believe. Principles tell you what to do when two beliefs are in conflict. A value might be "simplicity." A principle built on that value would be "We prefer removing a feature over adding a configuration option." Principles are operational. Values are aspirational.

How do I define product principles when I have no engineering team yet?

Start with the decisions you are already making, even if they are design decisions, scoping decisions, or choices about which customer feedback to act on. Principles apply to any decision-making process, not just engineering trade-offs. Write them based on the choices you have already made and the ones you anticipate as you grow. Having them documented early makes hiring conversations easier, because you can show candidates how you think before they join.

How often should product principles be updated?

Review them every three months in the early stages of a product. Once the product and team are stable, an annual review is usually enough. Always revisit them after a major pivot, a significant team change, or a strategic shift in who your core customer is.

How do I get a skeptical team to actually use product principles?

Involve them in creating the principles, not just reviewing them. Then use the principles yourself, publicly and consistently. When you reference a principle by name in a meeting to resolve a real disagreement, others see that it works. Behavior is more persuasive than documentation. One real use case in a team meeting is worth ten Notion pages.

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