I'm with Rachelle there. Being too clinical, as far as I am concerned, takes the fun away from doing lith work. I like the frequent surprises and some of the intangibles. I usually do a long exposure by eye-balling the neg and if I like the result, I do a few prints. Then I cut the exposure in half and, as the developer exhausts, it will give a different look. Repeatability is an issue sometimes but that's the nature of lith, which one has to accept. No test strips for me...but I never do that even for conventional printing.