engineering contract

In a total of 150-300 words , describe under what circumstances an engineer would want to specify a performance specification. Also, under what circumstances would an engineer want to specify a design specification? In your own words, provide 3 examples of a portion of work that is specified using the performance specification criteria (see chapter 32.12 in your book for examples. DO NOT MERELY COPY THESE EXAMPLES). Performance specifications set forth an objective or general standard that is supposed to be achieved, and the contractor is expected to exercise his ingenuity in achieving that objective or standard of performance, selecting the means and assuming a corresponding responsibility for the selection. Performance specifications specify the results to be obtained and leave it to the contractor to determine the best way to achieve the desired results. Therefore, the contractor not only warrants that the system will be constructed as planned but also that it will perform as intended. Design specifications, on the other hand, precisely state how the work is to be performed. Design specifications describe in detail the materials to be used and the manner in which the work is to be executed. There is no flexibility allowed to a contractor’s approach, and the contractor is required to follow design specifications as one would a road map. Here, the contractor does not warrant that the system will perform in any certain way.