Managers have the responsibility of the people development process to ensure the right people (commitment to the role, knowledge of work, problem solving capacity, and temperament) are developed in the maximum acceptable time and quantity (pace of demand) to meet the demands of the organization to fill the roles when needed.
Roles Filled with Capable People
Shook, J. & Marchwinski, C. (2014). Lean Lexicon: A Graphical Glossary for Lean Thinkers. Lean Enterprise Institute.
Liker, J. K. & Meier, D. (2005). Toyota Way Fieldbook. New York, NY: McGraw Hill Professional.