The involvement of private companies in port management leads to the introduction of a complex, multidimensional partnership with the port authority. This requires the establishment of a clearly defined, stable, contractual framework that enables the operator to quantify and manage the risks with which it will be confronted, and which is based on comprehensive legal procedures and techniques. However, no contract can provide for all eventualities. It is therefore necessary to include clauses that define the conditions and procedures for periodic reviews and negotiations for the purpose of making necessary adjustments. Apart from this renegotiation process, the option of issuing new calls for tender at periodic intervals during the lifetime of the project is a possibility, despite practical problems of implementation. In some cases, a clear division between infrastructure and equipment management and activities management may be desirable. See Module 4 for a full discussion of legal issues.