These three properties lie at the core of Lean Design’s Set-Based Concurrent Engineering and Just In Time Decision Making. By generating sets of possible solutions, conflicting design criteria can be assessed concurrently and actively during the design phases. In the case that different stakeholders are responsible for the diversity of criteria, the
tool streamlines the collaboratively set-up of requirements. Then, after the tool has generated feasible solutions, the
stakeholders can compare different options and search for a solution that satisfies the criteria of each individual
stakeholder. This “solution space exploration” process can lead to three different decision making options. One option is that the stakeholders determine that the requirements need to be adjusted. In this case, they can re-enter the requirements and have the tool generating a new set of feasible solutions. A second option is that each stakeholder has a different preferred design solution. In this case, each stakeholder can define its own range of preferences, and that solutions are selected at the intersections. A third option is that no solution satisfies all stakeholders concurrently. In this case, detailed information of the solutions performance indicators calculated by the tool can be used to negotiate and select one solution. Furthermore, as CAS enables the storage and operationalization of expert knowledge, it supports the maintainability of knowledge for future utilization.