Thinking in systems works in contrast to the traditional method of analysis, where one takes a system and breaks it down into different segments for ease of understanding. In the traditional method, one can contemplate doing away with one segment if it proves too costly, but in systems thinking one considers how to make each of the constituent systems cost-effective, as it is a crucial part of the bigger system.
This book dives deep into the subject matter and provides real life examples for the keen reader.