CASBEE for Heat Island Relaxation ,revised and updated in July 2010, reappraises greenery, more specifically, trees as being effective in mitigating a thermal environment. In concrete terms, tall and medium height trees and ground cover plants were assessed independently as cover over the ground, and it was established that the amount of evapotranspiration in the area of a tree crown was 3 times that of the same area of turf grass. In this paper we, as a committee, have used objective data to verify the process in the argument and established fresh criteria for evaluating medium and tall tree. Finally we have discussed our perceptions of what we think is currently lacking in the field of greening from the view of the continuing to improvement to performance evaluation.
