Where the implementation of the development project requires the conclusion of several contracts, the relations between the municipality, group of municipalities or public-private partnership and the various operators are organised by a prior memorandum of understanding, which may set out the general timetable for the project, determine the purpose of the various individual contracts and lay down the general conditions for the construction, management and transfer between the parties of public facilities and services, as well as the principles governing the financial obligations between the parties. The individual contracts concluded for each purpose comply with the provisions of the memorandum of understanding.