Supply chain management (SCM) involves integrating all functions across an organization to efficiently meet customer needs. While SCM is a newer term, the concepts have existed for decades. Toyota practiced integration across quality, processes, and maintenance as early as 1945. In the 1980s, manufacturers started adopting a "pull" philosophy in response to customers demanding higher quality and lower costs. SCM emerged as a concept after enterprise resource planning systems allowed greater integration across organizational functions. So SCM principles were practiced before, but it is now recognized as an integrated approach to achieve excellence through collaboration across an organization.