I believe the most useful and effective models for strengthening our intelligence are system ones—developed following the logic of Systems Thinking—since such models can explore complexity, dynamics and change. I consider Systems Thinking not only as a technique but primarily as a logical approach for observing a world of incessant dynamics and change, as well as a discipline for efficient and effective thinking. My objective is to present a set of five fundamental rules on which the logical structure is based and according to which the Systems Thinking technique is developed. Two general laws derive from these rules, laws which many ignore, leading them to produce behaviour which is inefficient as well as often inappropriate