It's not always obvious to see when you're making an impact, but knowing what you're trying to measure is a good start.

“The analysis reveals that there is no correlation between the cultural values a company emphasizes in its published statements and how well the company lives up to those values in the eyes of employees. All of the correlations between official and actual values were very weak, and four of the nine — collaboration, customer orientation, execution, and diversity — were negatively correlated.” Ouch.