To make better decisions and justify the decision making process, it is essential to introduce participation procedures that are not only for reflection of diversity but also for avoidance of arbitrariness. Various studies must be accumulated for the effectiveness and efficiency of participation procedures. In the previous study, we discussed ‘ participation' for a multi-criteria analysis. However, problems of participation need to be pursued more to become better. Therefore, we continue to study participation. In this study, we examined two cases that reflect diversity by participation procedures. Specifically, we examined “ the master plan for greenery and open space in Sagamihara City” and “ the master plan for Minuma-tanbo in Saitama City” . These two cases were designed by participation procedures. The former is diversification of a city area by merger, and the latter is an area that needs more supporters including citizens. Consequently, the results show that diversity by participation is composed of the following three diversities; diversity of participation stages, diversity of participation types and diversity of participation subjects, and that diversity by participation depends on how the participation is accomplished. To make efficiency in a limited time and a resource, it is necessary to appropriately combine participation methods. JEL Classifications: D71, D74, D81, Q57