MRP I was some of the first business software to be widely adopted during the 1970s. Manufacturers sought these systems in order to improve efficiency and accuracy when it came to basic processes such as production scheduling and inventory management.
By the 1980s, manufacturers realized they needed software that could also tie into their accounting systems and forecast inventory requirements. Enter MRP II, which included these integrations in addition to all the capabilities offered by MRP I. Enterprise resource planning (ERP) software features-which we'll cover later on-are included in the following table for comparison.

Reference:
- MRP vs. MRP II: What's the Difference?
- CIPS study guide page 118-119
LO 2, AC 2.3