How to Define Your Product Principles
Product teams make dozens of decisions every day that collectively determine what the product becomes. Most of these decisions are made without explicit reference to the product’s strategic direction — they’re made based on individual judgment, on team norms, and on the implicit assumptions that team members have developed over time. The quality and consistency of these distributed decisions determines whether the product has a coherent character or feels assembled rather than designed.
Product principles are the explicit articulation of the values and priorities that should guide these distributed decisions — the shared decision framework that enables team members to make consistent, strategically aligned choices without requiring PM involvement in every decision.
What Good Product Principles Look Like
Good product principles are actionable and discriminating — they tell you what to do in specific situations, not just what to value in the abstract. “We value simplicity” is a value statement; “When a new feature would add capability but increase complexity, we default to declining it unless the capability benefit clearly outweighs the complexity cost” is a principle.
The test for a useful principle: does it produce a clear recommendation in a specific decision situation? If two people could read the principle and reach opposite conclusions about what it implies for a specific decision, the principle is too abstract to be useful.
The Process for Developing Principles
Effective product principles emerge from the team’s genuine values and from the product’s specific competitive context — they can’t be borrowed from other companies’ principles lists without adaptation.
The development process:
Surface the implicit principles the team already follows: What do team members actually do when facing specific types of decisions? What trade-offs do they consistently make the same way? Identifying and articulating these implicit patterns produces principles grounded in actual team behavior.
Identify the decisions where inconsistency is most costly: Where are team members making different calls in similar situations? Where does the absence of a shared decision framework produce outcomes that feel inconsistent with the product’s character?
Test principles against real decisions: Draft principles should be tested against specific past decisions: does the principle produce the same decision that was made? If not, which is right — the principle or the historical decision?
Living by the Principles
Principles that are documented but not referenced in decisions provide no value. Building the habit of explicitly invoking principles in design reviews, prioritization discussions, and product critique sessions — “does this approach align with our principle that…” — creates the organizational use of principles that makes them genuinely functional.
Key Takeaways
Product principles are the explicit decision framework that makes values actionable. Good principles are discriminating enough to produce clear recommendations in specific situations. They’re developed by surfacing implicit team behavior, identifying decisions where inconsistency is most costly, and testing principles against real past decisions. Their value is realized only when they’re actively invoked in the decisions they’re designed to guide.
Principles in Practice
The principles that have the most impact are those that team members invoke spontaneously — not because they’re required to reference them but because they’ve internalized them deeply enough that they become the natural lens for product evaluation. Building this level of internalization requires consistent modeling by product leadership, visible application in real decisions, and the practice of making the principle invocation explicit: ‘We declined this feature because it would have violated our principle that…’ creates the associative memory that makes principles genuinely functional over time.
Key Takeaways
Product principles are the explicit decision framework that makes values actionable. Good principles are discriminating enough to produce clear recommendations in specific situations. They’re developed by surfacing implicit team behavior, identifying decisions where inconsistency is costly, and testing principles against real past decisions. Their value is realized only when actively invoked in the decisions they’re designed to guide.