Engineered Systems, Feb. 2014, by Scott Blackman and Michael Falkenstern.
http://www.esmagazine.com/articles/96371-problems-found-in-the-field-how-retrocommissioning-can-solve-them

"The symptoms are familiar: hot and cold complaints, higher-than-expected costs, etc. Here’s a look at how the retrocommissioning process should work to tackle these and other developments for your facility."