An incentive to build an intelligent system to cope with complexity derived from systems´ interaction-through the case of water management

How can one identify the complexity of a system? Having identified it, how can one cope with it? Facing these heavy issues, the authors explain and sketch their thoughts by stating the necessity of building an intelligent system to enable them to solve or partly solve the problems by dealing with one aspect of the complexity-the part derived from systems´ interaction. `Coping with the complexity´ then means to bring different levels of a systems´ interaction onto one so called `manageable level´. The authors propose the development of an intelligent system on the following levels: a functional level including a scope of its functions; a systematic level including a set of principles for its integration; a modelling level including an approach to model it