There are some activities during the course of your project that will need additional supplementary sketches, drawings etc.. in addition to the design drawings made by the Architect and Engineer or shop drawings made by each trade. You need to make sure that you plan ahead of time and review these sketches. These sketches include the coordination sketches between two different trades, especially for installation sequence. For example, after you install an underground pipe, you might need to have a sketch showing everyone how will you place the protecting sheet over it so that the traffic will be able to pass. These things are not covered in design drawings or shop drawings but nevertheless required.