Quote from Rationalize:
Does calcing in a spreadsheet count as manual?
I personally do not think so. I started out using a spreadsheet that got real-time quotes and changed colors to alert me as to when to get in and out of a position.
That's when I got the idea that I needed to develop a program to make the trades for me. Excel is an excellent starting place, but I wanted something much more user friendly and I wanted to be able to adjust the algorithms in the UI, not in code. I also wanted the ability to back-test and mine the back-tested results to determine if daily patterns could improve a systems performance.
I will add, that it's still much quicker just to get the program to make the executions. This way, you don't have to stare at the screen.