DRP uses several variables:
• The required quantity of product needed at the beginning of a period
• The constrained quantity of product available at the beginning of….
• The recommended order quantity at the beginning of….
• The backordered demand at the end of a period.
• The on-hand inventory at the end of…
DRP needs the following information:
• The demand in a future period
• The scheduled receipts at the beginning of a period.
• The on-hand inventory at the beginning of…
• The safety stock requirement for a period.