Building a Bidding System by Roy Hughes
A good overview of bidding methodologies and theory.
It covers:
relays - one side, asking for info
transfers -
dialogs - balanced transfer of info
Frequency of occurences of bids and useful bidding spce. Hence you should design the system with the more frequent bids having a lower value.
Slam Bidding, Constructive bidding, Destructive bidding.
Modern things like transfer advances and preempts. Their strengths and weaknesses.
It also has a short discussion of several popular systems (MOSCITO, SA, PRECISION, Polish Club). The author also presents a home made system.
Its a decent book, and I rate it a B.
To earn an A it would have had to have a section like "Common problems" or "what to look out for" when you design your own system. The book doesn't give me enough knowledge to design a system. It gives just enough knowldge to be "dangerous". I would like to have seen things like:
1) how Precision was refined and what its early problems were (and how system designers could avoid them)
2) be taught enough to evaluate a new system with holes. (either my own or someone elses)
A while back ZAR presented his ZAR Backbone bidding system. Some of the members here felt there were problems. I think some of the things they didnt like were:
a) an in bewteen bid (1D) halfway bewteen an opening bid, and a strong bid (like a 2 Club in SAYC).

the vulnerability to this system to interverence because you hadn't yet determined shape and fit
c) perhaps some NT issue.
It would be nice to have the author take us through some evaluative steps.
3) A "Check list" of evaluative steps to see if a sytem is robust.
What I'm asking is A LOT and would require another book.
The current book is good, but its just an introduction, like Building A Bidding System 101. I want to see BABS 201 and 301 and 401.
I've not seen any book like it. I found it far better than "Theory of Bidding" by Norman Squire.