Quote by Peter Drucker
Management by objective works - if you know the objectives. Ninety percent of the time you don't.
Summary
This quote implies that the management approach of setting objectives can be effective, but often managers lack clarity in defining these objectives. It suggests that in most cases, it is difficult to clearly identify and establish the objectives that will drive the actions and decisions of a team or organization. Without a clear understanding of objectives, the effectiveness of management by objective diminishes.