Definition
A design process model from the UK Design Council that visualizes work in four phases across two diamonds: Discover (diverge), Define (converge), Develop (diverge), Deliver (converge). The first diamond ensures you solve the right problem; the second ensures you solve it well. PMs use it as a mental model for balancing exploration with focus at each stage of product development.
Why It Matters for Product Managers
Understanding double diamond is critical for product managers because it directly influences how teams prioritize work, measure progress, and deliver value to users. PMs use it as a mental model for balancing exploration with focus at each stage of product development. Without a clear grasp of this concept, PMs risk making decisions based on assumptions rather than evidence, which can lead to wasted engineering effort and missed market opportunities.
How It Works in Practice
Teams typically implement this framework by following a structured process:
- Introduce. Share the framework with the team, explaining the problem it solves and when it is most useful.
- Calibrate. Run a practice session with a small set of real examples so the team develops a shared understanding of how to apply it.
- Apply. Use the framework on actual backlog items, roadmap decisions, or discovery questions during a dedicated working session.
- Review. After a cycle (sprint or quarter), evaluate whether the framework produced better outcomes and adjust how the team uses it.
The goal is not to follow double diamond dogmatically but to use it as a thinking tool that brings structure to decisions that would otherwise rely on gut feel.
Common Pitfalls
- Applying the framework mechanically without understanding the reasoning behind each step.
- Using the framework as a substitute for product judgment rather than as an input to decisions.
- Skipping calibration sessions, which causes inconsistent scoring or categorization across the team.
Related Concepts
To build a more complete picture, explore these related concepts: Design Thinking and Design Sprint. Both share the double diamond's emphasis on divergent and convergent thinking; see the design thinking vs design sprint comparison for guidance on when to use each approach.