Traingin log
I would be lost without my training log.
I let reps dictate when I increase the weight.
Say my target range is 4-6 reps on a lift, I continue at the same weight generally untill I get 6 perfect reps, then the next week I increase the lbs so that I only get around 4 and so on up untill getting 6 reps again, this is done for every lift.
Once and awhile I get over anxious I try to up the lbs each week, sometimes it works others just overtrains me, for some bp such as legs I find I can get away more with increasing the lbs each week, other bp's just cant take it.