This document discusses inventory control and ABC analysis. It defines inventory as materials, parts, supplies, tools, and products kept in stock. Inventory control aims to ensure adequate supply of medicines. ABC analysis classifies inventory into A, B, and C categories based on annual usage value. High value A items that constitute 10% of inventory account for 75% of total value and require close control. B items account for 15% of value and C items account for 10% of value with loose control. ABC analysis can be used to prioritize inventory management and determine reordering strategies.