My general strategy - usually applied on a much smaller scale - was the first time I needed to do something similar (or the same) I'd copy the code. The second

My general strategy - usually applied on a much smaller scale - was the first time I needed to do something similar (or the same) I'd copy the code. The second time, I'd consider abstracting it. By that time I had three applications and could better identify what was common and what was specific to a particular usage. I wonder if something like that can be applied to larger libraries.