I'm going to disagree with DOMS being an indicator of growth. It can be an indicator or irritation if a muscle hasn't adapted to the training stimulus, or it could be that the muscle was overworked. I like using total workload as a measure of progress. I did full body routines 3 times a week with a couple sets per bodypart while avoiding failure and found that while the weights increased, I never got sore even though my total sets would hit anywhere from 10-12 for the week per bodypart. Then, when I started doing split routines, I was doing that many sets per bodypart in one workout. I became sore because of a new stimulus, but I then stopped feeling sore. I have made progress without soreness(actual increase in muscle size) so I don't believe it holds true. Of course, if you read some Ironman articles, you'd be told that it's an absolute necessity to become sore. If you lift more weight for more reps, you'll get bigger, no question.