What is the main difference between a Scanlon plan and a Rucker plan?

Question $3$ options:

A Scanlon plan requires worker committees while a Rucker plan does not.

A Scanlon plan is dependent on productivity norms while a Rucker plan works better without them.

A Scanlon plan is a gain$-$sharing plan while a Rucker plan is an individualized incentive plan.

A Scanlon plan focuses on reducing labour costs while a Rucker plan focuses on increasing labour costs.

A Scanlon plan involves a less complex formula than a Rucker plan for determining worker incentive bonuses.