The double diamond is a well known design thinking model. The main feature of this model is the emphasis on divergent and convergent thinking, where at the start you explore many ideas, before deciding on the right idea.
We, the Wednesday Design team, take this approach in both the diamonds- once to reach our problem statement and list of possible solutions and once to create the solution itself.
*The Wednesday Double Diamond Design Framework*
Following the framework is a non-linear, iterative process. For example, sometimes it maybe required to collect information and prototype throughout each stage of the project to bring ideas to life and visualize the problem solutions as we go.
The framework works for both 0-1 as well as, 1-n clients. Ideally, the same 4 phases should be repeated every time you design, let that be while building a product from scratch or simply adding a new feature.