"Our goals can only be reached through a vehicle of a plan, in which we must fervently believe, and upon which we must vigorously act. There is no other route to success." — Vincent van Gogh
Goals should be accompanied by a detailed plan of how each goal will be achieved. Goals without plans are little more than wishes. The plan will detail the steps that will be taken to reach the goal: who will be responsible for each step, resources that will be required, a timetable. The supervisor should assist the employees with the planning process, and should agree to the plan.
If the plan is carried out and the goals not reached, the problem is in the plan, not in the employee. Remember, Plan-Do-Check-Act is a process of continuous improvement. If the plan doesn't achieve the result, improve the plan and try it again. Since progress will be monitored on an ongoing basis, and the plan will include a timetable, lack of progress should be evident well before the time the goal is to be accomplished, The lack of progress is a signal to revise the plan.