A ridiculously well-researched book and very fun to read if you have/had any interest at all in ST:TNG. Not only does it go through the technical specifications of how warp drives, transporters, holodecks, and bridge controls are supposed to work, it includes "real-life" notes on how certain things came about (like the GNDN tubes and the "pool table" in Engineering) but it explains how certain technologies work from the creator's point of view (like Mike Okuda's comment on the Heisenberg Compensator or the establishment of Warp 10 as a speed limit). The cross-section map of the Enterprise with the hamster wheel in Engineering and the Porsche parked in the shuttle bay are almost worth the price of purchase alone.