3 Ardavan Asef-Vaziri Jul-09Theory of Constraints: 1- Cost Accounting Lean evolved from the collective effort of a number of individuals. TOC owes its origin to Eli Goldratt, an Israeli physicist. The basic idea originated in 70s and was published in The Goal (1984). Like the links of a chain working together to lift objects, the processes within a supply chain work together to generate profit. The ability of the chain is limited by the strength of its weakest link. The goal of an enterprise is to make more money, now and in the future. Theory of Constraints (TOC)