The promoter who is able to plan well in advance so that he can define exactly what he wants and can give his designers adequate time to complete their work, will usually get best value for money. Acontractor who tenders for works that have been designed in all essentials and which are not subse- quently altered, will usually be able to give a good price and fast construction. Time spent ensuring adequate site investigations, full working out of the best designs, and careful production of contract documents, is the best guarantee that construction of a project will be trouble-free, on time and to budget