Economical design requires systematic work. The first step is to acquire the detailed and complete part drawing; the next step is to accumulate additional pertinent information relating to the machine tool to de used and to the available accessories and general-purpose work holder. All fixtures required for the complete machining program for the part are first laid out in sketches and reviewed together, a procedure that quite frequently results in useful modifications of the initial program, sometimes even in a revision of the design of the part. With these steps signalized, the shop drawings of all the fixtures can be prepared, lessening the risk of unpleasant surprises.