I already have a what I feel is a pretty good grasp on technical analysis: I've read TAFM twice and absorbed most of it. I know what most all of the indicators do and I have a decent feel for how markets flow. After reading about William Eckhardt in new market wizards I want to try my hand at system design. I've got experience programming and I'm good with math so it seems like something I'd be good at. What are the best books about system design? I'm looking to trade equities interday (no desire or time to trade intraday).