Models Assurance that Plans are Correct.   Arrest costly errors.     Facilitate communication.     Over come technical barriers.     Speed client approval     Model is the project engineer’s best friend     Expedite agency approval     Eliminate interferences     Client-contractor co-ordination is improved.     Unusual constration problems can be recognized & usually solved or improved.     Simplify progress report     Models help to reduce costs & meet schedules     You can’t integrate number of drawings, but you sure know what’s going on with the Model