The Conservatory of Natural Spaces Normandie Seine (CenNS) is an association Loi 1901 that contributes to the preservation of the natural, landscape and geological heritage in the high-Norman territory by developing knowledge, protection, management, enhancement of natural spaces and supporting public environmental policies. It currently manages 85 natural spaces, representing approximately 1 331 ha of limestone hillsides, 293 ha of wetlands and 229 ha of alluvial terraces.On each of the sites it manages, the CenNS bases its policy on the implementation of an ecological management plan, based on an ecological and socio-economic diagnosis, the assessment of the issues and the definition of long-term objectives in the medium-term objectives and operations. The implementation of these management plans is a common practice of the Conservatory of Natural Spaces. It has become mandatory since 11 September 2014, the date of signature by the regional prefect and the president of the regional council of the order approving the CenNS.The decision on the approval is taken on the basis of the submission of an action plan including the obligation to carry out a scientifically validated management plan for each site for which the conservatory is responsible (Decree n°2011-1251 of 7 October 2011). Currently, on the 85 sites managed by the CenNS (excluding the 12 sites “bat-gîtes” which do not require a management document):- 26 sites have a management document in the Seine-Maritime department (on 33 off-site sites in Chiroptères);- 35 sites have a management document in the department of Eure (40 off-site sites in Chiroptères). Among the 6 sites concerned by this request, 4 have already been managed by CenNS for several years: Belbeuf, on time, through funding from Natura 2000 contracts in particular; Croixdalle and Mesnil-Lieubray by farmers, via EAWs; and Mesnières-en-Bray through the organisation of volunteer sites. However, due to lack of funding, these sites do not benefit from up-to-date management documents to evaluate the management carried out and to plan efficiently the conservation actions of these calcareous slopes.The other two sites (Neuf-Marché and Villy-sur-Yères) are sites newly agreed by the municipalities concerned with the Conservatoire. These are the first management documents for these two sites.