Table 1 Comparison of outdoor space eco-friendly evaluation tool

Assessment items	SITES (U.S.A)	Berlin green factor (Germany)	Seattle green factor (U.S.A)	Helsinki green factor (Finland)
Site	√
Soil	√	√	√	√
Water	√	√	√	√
Ecosystem	√	√		√
Health	√
Maintenance	√			√
Green roof/wall		√	√
Vegetation	√		√	√