Be careful not to take the information here at face value. There are sound ideas to extract from the book, but they're often embedded in horrible ones. I'm not convinced that the author has written more than one program in their life, and that was in the 1970's. When he contrasts "Flow Based Programming," which has nearly enough in common with the Actors model so as to be indiscernible, with "traditional programming," I'm pretty sure he means "assembly," because anything that he suggests is difficult in traditional programming is trivial to do with language standard libraries in 2013, even in C.
That said, it's a very interesting and fruitful paradigm, both for its potential for visual programming and for inherent concurrency, so its a shame that this is the only real source on it.
The Kindle edition has no useful ToC and no valid page number references. For this reason, I wanted to return my copy, but it was too late. I recommend you read the free first edition on the author's website, for the perspective that it can provide if you haven't been exposed to similar ideas before (Actors, Dataflow,) but don't waste your money on the second edition, as not much has changed (although it definitely should have.)