In this report we aim to clarify collective form by combination of the dwelling units in collective housing. It is one of the important subjects which decides the compositional characteristics of the building, that is how to make the spatial units by dwelling units and how to combine them. First, we found there were some ranks in the units defined by scale and grasped the composition as hierarchical combination of units. Secondly, we analyzed the differences between the units in each ranks, which concern the diversity and homogeneity of collective housing. Then we found 10 typological compositions of collective form in collective housing. All types were grasped as coexistence of diversity and homogeneity on different levels. The above results indicate the range of the collective form in contemporary Japanese housing, and we think these results are effective indices to design collective housing in future.
