This document discusses capacity planning and management. It defines design capacity as the maximum theoretical output and effective capacity as the expected output given operating constraints, which is usually lower than design capacity. Utilization is defined as actual output over design capacity, while efficiency is actual output over effective capacity. When demand exceeds capacity, curtail demand or increase capacity long term. When capacity exceeds demand, stimulate the market or make product changes. Methods for expanding capacity discussed include break even point analysis and decision trees.