The reach of dynamic plan generation for enterprise planning Web services

There is a trend in information and communication technology services from fat client installations to customizable Web services. The authors are engaged in the development of some planning service for small and medium size enterprizes. For this service, they adopt and adapt a certain dynamic plan generation approach. The crucial question is to what extent the service of planning may be completely automatic. In contrast, how much interaction between the human user and the planning system is inevitable and why is this the case? The answer is some mathematical theorem about the characteristics of plans resulting from dynamic plan generation.