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, production, and maintenance from 1945-1975. In the 1980s, manufacturers shifted from a "push" to a "pull" model in response to customers demanding higher quality and lower costs. SCM emerged as a concept after enterprise resource planning systems allowed greater data sharing across departments. So SCM principles were practiced before, but are now more formally recognized under the SCM label to drive overall business excellence.