The design of the territory project within urban plans comes from a public action instrumentation. The construction of a metropolitan master plan is the source of conflicting interests. In order to succeed in the project, seeking consensus is the rule, to the detriment of its operational aspects. In this context of interpretation, we have for hypothesis that the landscape policies in the urban plan’s aren’t enough defined for an efficient implementation to reach their objectives. Adopting a landscape policy assessment as a tool for the public action analysis, we propose to analyse the SYSDAU’s intervention in his 2001 urban plan. We have experienced a 4-step approach: a historical analysis, a reconstitution of the action theories, the compatibility analysis between the master plan and three different land use plans, and finally, the analysis of the way the population perceive the landscape. The results from this approach help in identifying the efficiency of the landscape scheme, but also its limits. The assessment aims at, not only explaining the impacts of landscape public policy in 2001, but also understanding their mechanisms, that lead to success or failure. The results show how important the landscape is in building a territory program, and it reveals the strength of a landscaped approach in any urban planning. So, we can now offer to the different actors an evaluation of their land policy following an “ex-post” approach, and thus, identify the leverages or the possible ways to improve the wording of the landscape policy of the SCOT to come.
