Where multiple communes exist in close proximity but have different objectives, there is a need for a mechanism to resolve these overlapping, but incompatible objectives in land use and other topics. As copiously illustrated by the example of the Grand Clermont metropolis, different laws and rules promulgated by national and local authorities as well as rules and land use zonings issued from EU decisions (like ZNIEFF or green and blue corridors) structure these relationships and ensure a coherence between all these institutional constraints and the various levels of decision making. But at the same time, one has to cope with the issue of the multiple planning documents and the governance structures that support them.