Double Diamond (design process model)

Double Diamond is the name of a design process model popularized by the British Design Council in 2005. The process was adapted from the divergence-convergence model proposed in 1996 by Hungarian-American linguist Béla H. Bánáthy. The two diamonds represent a process of exploring an issue more widely or deeply (divergent thinking) and then taking focused action (convergent thinking). It suggests that the design process should have four phases:


 * Discover: Understand the issue rather than merely assuming what it is. This phase involves speaking to and spending time with people who are affected by the issues.
 * Define: With insight gathered from the discovery phase, define the challenge in a different way.
 * Develop: Give different answers to the clearly defined problem, seeking inspiration from elsewhere and co-designing with a range of different people.
 * Deliver: Test different solutions at a small scale. Reject those that will not work and improve the ones that will.

To celebrate 20 years of the Double Diamond in 2023, the Design Council released a visual representation under an open license and created a Mural template.