Instruct: Classify the given review as either positive or negative.
Query: A reader in the Netherlands

I am an UML trainer and have used all three books by the amigos. I shall relate what my students have to say ... The reactions from my students is that the Booch book lacks depth (my students work in embedded systems, workflow, CAD ...), repeats itself and is unsuitable for serious work. Booch's earlier books did have some real applications (for example, the Home Heating System). In particular, his use of state machines was good. Today, they have been scaled down somewhat (they are mostly of the so-called anthroposophic kind and thus useless). Concluding, it is a pity that someone with the wealth of knowledge and background that the author has has not taken the effort to produce something of more value. After all, novice developers look up to the 3 amigos as being the 'gurus' of UML.