Abstract: A method for planning product groups is provided. The present method is characterized in that selecting processes from a process group according to the rule of the sum of production capacities of the processes in proportion to the total production capacity of the process group not less than a predetermined ratio and the demand production capacity per month of the processes not less than a predetermined value. Then, defining each of selected processes as a product group. Finally, incorporating the unselected processes of the process group into the product groups according to process resemblance.

Abstract: An alternative resource model. The alternative resource is suitable for a first resource and a second resource. A first process and a second process are performed in the first resource and the second process and a third process are performed in the second resource. A pseudo resource is provided and a capacity of the pseudo resource is equal to a sum of a capacity of the first resource and a capacity of the second resource. The first process is allocated to consume the capacity of the first resource and the capacity of the pseudo resource. The third process is allocated to consume the capacity of the second resource and the capacity of the pseudo resource. The second process is allocated to consume the remaining capacity of the pseudo resource.