Inspection has been assuming an increasingly important role in construction, becoming the main driver for the proper execution of works. The supervisory entity and the owner's representative is responsible for all the management and coordination of works as well as all the implicit bureaucracy and guarantees that the services are carried out on time , with high quality and with a good cost-benefit ratio. In addition, safety , health and environmental protection must be guaranteed. Construction monitoring can be carried out on behalf of the client as well as on behalf of the contractor.