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The traditional grouping method in batch manufacturing is functional grouping. In this approach, similar types of machines are grouped together. It has a number of limitations like considerable distance traveled by products, high levels of material handling and long lead time. To avoid this industrial manufacturing enterprises use group technology concept which basic idea is to manufacturing system be segmented into adequate subsystems. In order to do that it is necessary to form groups of products which are associated to these manufacturing subsystems. Group technology identify and brings together related or similar products and takes advantage of their similarities. Product are grouped into families of parts, and machines into manufacturing cells. Machine– part matrix representation is most frequently used to present the problems of group technology.

The aim is to forming the group of work pieces which are manufactured in one production system. Second aim of grouping is to smallest number of different work pieces be operated in one production system. Preliminary technology process has to be making for each work piece. Based on them, the matrix which connects the work pieces and machine tools is formed. The matrix of utilization gradients for machine tools and production system are accounted. The single work pieces, with utilization gradient which are higher of demanding, would be extracted from matrix. The rest of work pieces forming the sub matrix. The groups of work pieces are formed through joining of each work piece with all others. Proceed with extraction of two-pieces, three-pieces till n-pieces groups. As result appears the groups of work pieces with manufacture similarity, clear technology and manufacture concept, define kind and quantity of production's equipment, necessary production space, transport equipment...