Writing a book is a huge project. This is my second book, and somehow I thought it would be easier this time around. It wasn’t. The original four-month estimate to write the manuscript has stretched out into much more than a year. I’m very happy with the results, though. Writing a book about a subject so near and dear as Jess is to me is a dodgy business: I think I’ve steered clear of the minefields of self-indulgence and created something that will be useful to everyone interested in rule-based software.

Writing a book is such a huge project, in any event, that no one does it alone—least of all me. I’ve had help from many kind, generous, and talented people during the whole time this book was being developed.

One standout ...

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