This document discusses various techniques for inventory control including ABC analysis, XYZ analysis, VED analysis, FSN analysis, and SDE analysis. ABC analysis categorizes inventory items into A, B and C groups based on their value and consumption. XYZ analysis categorizes inventory based on profit impact and ease of stock-out. VED analysis categorizes inventory based on vital, essential and desirable groups. FSN analysis categorizes inventory based on fast-moving, slow-moving and non-moving groups. SDE analysis categorizes inventory based on storage, demand and expenditure factors.