Under PFI contracts and most PPP contracts the responsibility for constructing the facilities sits with the Contractor. Therefore the construction period will be a period when the Authority's role in the project will be relatively restricted. However there are still some important rights and responsibilities allocated to the Authority and the Contract Manager should be fully aware of these. As the Construction period is a series of one off interrelated events the rationale for investing time and effort in developing and documenting management systems is less than during the operational period. Nevertheless the Contract Manager should ensure there are sufficient robust arrangements set out in the Contract Management Manual for managing the Contract during the Construction period. The Construction Period is covered in Clauses 13-21 of the WIDP Contract (Part III - Works).