The task-relevant maturity of your staff is determined by how long they have been on the job and how competent they are determining your method of delegation.
Low task-relevant maturity means they are new and inexperienced in the job. In this case, use a directive delegation style. Tell people exactly what you want them to do.
Medium task-relevant maturity means staff has experience in the job; they know what they are doing. In this case, use the effective, management-by-objectives delegation method. Tell people the result that you want and then get out of their way and let them do it.
High task-relevant maturity is when the staff person is completely experienced and competent. Your method of delegation in this case is simple, easy interaction.
Click here to view a video about the art of delegation.