Theory of Constraints (TOC)

Describe an example where Theory of Constraints (TOC) was successfully applied to improve a process, or where you saw the potential for TOC to improve the process, in either a company you worked for or a company you were a customer at. What is the lean concept and why is it important to study? How can lean be applied to manufacturing and service processes? What is work center scheduling and why is it important for firms to focus on?