1)What makes a constraint critical or active? Explain. 2)Jim has used the t

1)What makes a constraint critical or active? Explain.

2)Jim has used the theory of constraints to maximize the production of his active constraints and match the production rate in the rest of his
facility to the bottlenecks. Output of finished goods per week has improved by 15% and WIP across the facility has decreased 40%. But his efficiencies on some
individual workstations have dropped by 50% and the boss feels that this is cutting into already slim profit margins. What is going on? What should he
do?

Please be serious when responding this. Do not do it just for the points I really need correct answers ASAP! thank you!