## 8.3 Design blocks Design blocks are part of an iteration as a starting point to challenge the requirements that are seen as assumptions for each feature. Design blocks are based on design thinking techniques, focused on materialising the work items that need to be delivered in the next iteration. From a practical point of view, Design Blocks take the form of a set of workshops where the Agile Project Core Team (A- PCT) and other stakeholders meet, discuss and declare the assumptions related to a feature or the work items for the next iteration. The facilitator and coordinator (UX specialist) drives all the participants to prepare a low fidelity prototype, by sketching the future feature altogether. The UX specialist makes sure that the design, interaction, behavior, requirements and technical matters are thoroughly discussed, understood and agreed upon by everyone. When the Agile Project Core Team (A-PCT) feels confident on the feature’s specific low-fidelity version, the User Interface (UI) designers provide a high-fidelity prototype, where UI standards from existing design libraries are applied. This high-fidelity prototype will then drive the coding of the feature, as part of the daily work of the team.