This article discusses limitations of the traditional design process model called the “double diamond” and proposes an improved “triple diamond” model.
The double diamond is a useful tool to explain the design thinking process, but it lacks clarity around outcomes and can imply the design work ends after prototyping. However, the author argues design iterations are still needed after prototyping when development begins.
The triple diamond model proposed breaks the process into three distinct “diamonds” with clear outcomes: 1) research to form hypotheses, 2) proof of concept prototyping to test hypotheses, and 3) further design and testing to launch a product. Each diamond builds on the last, with the designer involved throughout.
This model helps align expectations that design is iterative and continues into development. It promotes collaboration by clarifying roles and maintaining designer oversight after prototyping. The article provides examples of tasks that could be included in each diamond stage and discusses applying the triple diamond to designing new products from scratch.