I saw these two pages a few weeks ago and found them fascinating (OK, I am a bit of a nerd 
) Very detailed...uses the basic Toll House recipe to begin with, then tweaks. 
Lots of pics of results.
http://www.handletheheat.com/2013/07...p-cookies.html
http://www.handletheheat.com/2013/08...es-part-2.html
"Have you ever wondered why chocolate chip cookies can be chewy, crisp, soft, flat, thick, cakey, greasy, bland, flavorful, moist, or crumbly?
In this post I’m going to share with you how various ingredients and techniques can affect the taste, texture, and appearance of your chocolate chip cookies. This will hopefully help you understand how chocolate chip cookies work so you can make the PERFECT batch every time, whatever you consider to be perfect..."