Planning theory entails that planning must be done after considering the requirements, opinion and suggestions from everyone in an organization. This is because employees at all levels will be able to give their input which is very valuable and realistic. On the other hand, an open system Approach to management, is also of the view that the systems of the organization must be run by taking every employee along. Thus they are both similar in view and application.
Any organisation that fail to plan has already fail what do you understand by the above assertion