The need to regulate the development of subdivisions became evident when it was found that the dictum of "let the buyer beware" did not satisfactorily protect individual land buyers or the interests of the general public. Anyone who engages in the land subdivision process should be familiar with both the state and local regulations. In most states, the preparation of final subdivision maps is restricted to work by registered civil engineers or licensed land surveyors. If the cost estimates indicate that an excessive investment would be required when compared with anticipated revenues, then a redesign of the subdivision at the stage is indicated. Review the preliminary subdivision map and the cost estimates with the developer, and with other members of the development team. The job of preparing a tentative map consists of refining the general design of the subdivision, and doing the necessary engineering analysis and design.