1.7 A concept development is usually expressed as a sketch or as a model and is often accompanied by a brief textual description. It is a process where the structural development of the design concepts take place 1.8 1.9 1.10 Improvement on existing product involves the major redesign of an existing product primarily to improve .......... is computed by dividing the total manufacturing costs for some period (usually a quarter or a year) by the number of units of the product manufactured during that period. The components of a product (also simply called parts of the product) may include 1.11