Double Diamond (design process model)

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Diagram showing two adjoining red diamonds with named stages: “Discover”, “Define”, “Develop”, and “Deliver”
The Design Council's visual representation of their Double Diamond design and innovation process.

Double Diamond is the name of a design process model popularized by the British Design Council in 2005.[1] The process was adapted from the divergence-convergence model proposed in 1996 by Hungarian-American linguist Béla H. Bánáthy.[2][3] The two diamonds represent a process of exploring an issue more widely or deeply (divergent thinking) and then taking focused action (convergent thinking).[4] 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.[4]

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.[5][6]


  1. ^ "Eleven lessons. A study of the design process" (PDF). Design Council. Retrieved 2 December 2022.
  2. ^ Banathy, Bela H. (1996). Designing Social Systems in a Changing World. Springer US. p. XV, 372. ISBN 978-0-306-45251-2.
  3. ^ Möller, Ola (9 January 2015). "The Double Diamond". MethodKit Stories. Archived from the original on 21 December 2022. Retrieved 3 September 2019.
  4. ^ a b "What is the framework for innovation? Design Council's evolved Double Diamond". Design Council. Archived from the original on 26 September 2019. Retrieved 6 April 2021.
  5. ^ "From humble beginnings to a cornerstone of design language". Design Council. Archived from the original on 11 May 2023. Retrieved 11 May 2023.
  6. ^ "Double Diamond template". Retrieved 11 May 2023.