It is all too easy for managers to fail to outline, and agree with their employees, what it is that everyone is trying to achieve. MBO substitutes for good intentions a process that requires rather precise written description of objectives (for the period ahead) and time-lines for their monitoring and achievement. The process requires that the manager and the employee agree to what the employee will attempt to achieve in the period ahead, and (very important) that the employee accept and buy into the objectives (otherwise commitment will be lacking).
For example, whatever else a manager and employee may discuss and agree in their regular discussions, let us suppose that they feel that it will be sensible to introduce a key performance indicator to show the development of sales revenue in a part of the firm. Then the manager and the employee need to discuss what is being planned, what the time-schedule is and what the indicator might or might not be. Thereafter the two of them should liaise to ensure that the objective is being attended to and will be delivered on time.
Organisations have scarce resources and so it is incumbent on the managers to consider the level of resourcing but also to consider whether the objectives that are jointly agreed within the firm are the right ones and represent the best allocation of effort.