An alternative to scheduling individual processes. The customer process withdraws the items it needs from a supermarket, and the supplying process produces to replenish what was withdrawn. Used to avoid push. (OneSixSigma.com Glossary)
Other Definitions
Pull System – A customer driven work replenishment system involving ‘pulling’ the exact quantity of parts required out of a finished parts stores. A Kanban issues the instruction to replenish the stock.
(Industryforum.co.uk)