Emanuel Derman’s book, “Models.Behaving.Badly”, gives a physicist and quant’s perspective of models Vs theories, their nature, what to expect of them, how to differentiate between them and how to cope with their inadequacies. Derman starts off by citing a few incidents from his childhood in Africa, where political models, social movement models failed badly. He then talks about the need to understand the crucial difference between theories and models, thus providing the necessary motivation for a reader to go over the book.