One of the most popular Design Thinking models is the Double Diamond model. It describes Design Thinking as alternating cycles of divergence thinking (expanding, research, and exploration) and convergence thinking (narrowing and analytic). It shows the progress of a process as two diamonds: the first diamond concerns the Problem while the second one concerns the Solution.

Both stages occur after each other in a similar way:

• first the designers’ perspective is broadened, which in turn allows them to widely think about what in a determined phase is the most important part;
• next, they focus on the analysis of collected data, selection of key information, and choice of ideas that are the best in a given category.

Therefore, the application of the Double Diamond model consists of passing through 4 stages:

1. Application of research methods in order to identify as many possible problem that users have (or may have) as possible,
2. Analysis of identified problems, reaching into their causes, and focusing on those vital parts,
3. Use of creative methods to generate as many ideas addressing selected problems as possible,
4. Application of prototyping and testing methods in order to select and improve chosen ideas.