Why only 3 stars?. Ok. Maybe is 4 and a half if you are an american citizen. The reason is beacause many of the information is recopiled from other sources. You can divide the book in 3 sections. One is like extract of an administrative course, like an MBA or something similar. The other are more a "common sense" recomendations, like "don't argue too much", "do not fight with your partner". Like mom's suggestions. And the last one (more than a half of the book) is like an adaptative version of the CIA factbook (avaible on Internet, and of course, up to date), where the author describes for each country a general overview of it, but never profundize on their culture or what about the relation with other country; only with the americans. Let me show you some examples: With my country (México) he suggest not to talk about or borders or the inmmigrants, but never talks about the religion, the political relation with other countries. There is no need to say that the author never talks about the culture, what kind of thinks hates or loves people form different cultures, how and why they act in some ways; he is like saying that japanese or the turkish are almost the same, only they likes somethings and dislikes other ones. He only talks like saying all the time: "(if you are an american)... do not argue with japanese about the relation with USA in the WWII". Welll.. What if I am not american?
At last, is good "general overview" reference book; but basically most usefull if you are an american citizen (and is not complete).