KPIs for Professional Services Organizations [reference to external article]

I just came into an article proposing the KPIs (Key Performance Indicators) the author promote them as essential for PSOs (Professional Services Organizations), and I felt like sharing it since I found it very neat and away of many jargon complications:

http://spiresearch.com/spiglass/2013/10/what-are-the-essential-kpis-for-professional-services-organizations/

Thanks Jeanne Urich!