Material control refers to the management of acquiring, storing, handling, and using materials to minimize waste and losses while maximizing economy. There are different levels of inventory like maximum, minimum, reorder, and danger levels. Techniques of material control include setting inventory levels, economic order quantity, just-in-time systems, ABC analysis, and VED analysis. Stores are also classified into reorder level, minimum level, maximum level, average level, and danger level based on formulas involving usage, lead times, and other factors.