I have found that what works best (for me) is to ram as much blood into the working muscle i,e the biceps. With light weight high reps and relative quick pace of 2 sets no counting on the reps.
I then move into standing cambered curl bar for a heavier weight and curl till I am in pain, again not counting the reps.
Counting only tells you one thing, how far you are going to go. Why not let the muscle tell you how far IT can go? Let the muscle cancel its own ass into failure. Go til it bleeds!!
Ram the weight up towards the shoulders but never all the way to the top, this takes away from the tension on the muscle. Do not lower all the way to the bottom as this takes away from the constant tension as well.
In short "Constant tension" will get the job done sometimes in one set if done properly.
Get a pump first
Do not count reps
Do not pause
Do not perform a full range of motion.
Try this before you knock it
The huksters in the magazines and the books will hardly ever tell you how to correctly train. they want you to fail so you can come back for the new improved rehashed workout.