Empirical Data on Refactoring?

Are there any empirical studies that show the impact of refactoring (or lack of refactoring) on a development team's productivity?

(NOTE: I'm only looking for empirical data--From my own experience, I personally know that refactoring works, but I was wondering if there was some hard data to back that claim).

14.10.2009 00:30:00

This article looks to have the info you seek.

14.10.2009 00:32:19