One glance over the almost landlocked harbour explains why Andrea Doria, the 16th-century Genoese admiral, remarked that the Mediterranean had only three safe June, July, and Cartagena.
Andrea Doria lived during the 16th century.
Using cost models to estimate the cost and length of time necessary to develop a new software system, for example, is appropriate only after requirements have been defined, a system design has been developed, and the size of the new system has been estimated.