When engaged by a client to evaluate special engineering conditions providing explanations or repair methods, time can be spent in acquiring knowledge and information not yet possessed by the Engineer. The Engineer's expertise goes to being diligent and economical in obtaining such added knowledge for the benefit of the client. However, his base of knowledge also increases, which will be helpful in future work. Often it is necessary to buy new materials such as computer programs and literature (these items, depending how specialized, should be probably be considered part of the cost of doing business). Since charges for evaluation work can exceed the client's expectations and become hard to explain, I wonder what are the colleague's opinions on the subject, with the idea of collecting adequately and keeping a happy client.