What is a Blocker? A blocker is an employee who is preventing or “blocking” others from moving into a key position. Key positions serve as critical steps in a career path or offer a unique set of developmental experiences required for other roles in the organization. Companies should seek to fill key positions with high performing, high potential employees. We use the term blocker to describe individuals who are performing at or above expectations in a key position however they do not want to move out of the role for a variety of reasons. The individual may enjoy the role, may not have a desire to work additional hours or relocate, or do not have an interest in learning new skills and taking on additional responsibilities. The lack of desire to take on a new role or move to a new position limits their future potential, as well as the potential of others in the organization.