The document traces the development of ERP software from the 1960s to the present. It began with inventory control systems in the 1960s and evolved to include MRP in the 1970s to manage materials requirements. MRP II was developed in the 1970s to enable full manufacturing management. ERP systems emerged in the 1990s to integrate across the entire enterprise. CRM and SCM were later added to manage customer relationships and supply chains. More recent developments include integrating ERP, CRM and SCM and moving systems to the cloud.