produce is constrained by the range of available equipment and the required sequence of work. however, some manufacturing requirements are more easily accommodated across a family of machines and by using variable work sequences than are others. in many situations,a specific machine or work task tends to constrain or act as a bottleneck to the overall manufacturing process. likewise, logistical capability to accommodate different patterns of equipment utilization may serve to enhance or constrain flexibility of the manufacturing process. Manufacturing executives devote substantial time and resources to eliminating bottlenecks that serve to constrain operations. The structure for focusing managerial attention is captured in theory of constraint methodology