It's been my privilege to have been part of a number of outstanding recruiting efforts/departments/teams. But the one that strikes me as the absolute best (incl. most effective, most efficient, and most fun) was being part of an in-house recruiting organization for one of the Big 4 management consulting firms.
There were a number of reasons for my feeling that way. A few examples include:
1. Recruiting was a valued part of the organization - we were treated as professionals with an area of expertise and we were allowed to demonstrate that expertise (they didn't mess with us about how we did our jobs) to the fullest of our capabilities.
2. As Recruiters, we (mostly) felt appreciated and were a part of the team, both overall and within Recruiting. As such, we were highly self-motivated and very passionate about our work.
3. That organization invested more in us, as Recruiters, than any other entity I've ever been affiliated with. This included excellent training (both specific to recruiting and other professional development, plus conferences, etc...) to the extent that we could take the same professional development courses that the consulting professionals did.
There are numerous other reasons why that particular experience was so professionally rewarding but, IMHO, the bottom-line reason why I consider that to be a world-class model was because Recruiting was recognized as being it's own function and was seperate from HR.
One of the keys to being successful in recruiting in a professional services firm is to recognize that some people are better suited to careers in consulting and some people are better suited to doing similar work, but in a corporate environment.
I suggest that the same type thing applies to the difference between careers in Recruiting and HR (in all it's various flavors). They are not the same thing, they require completely different skill sets and personality styles, and success in one does not guarantee success in the other (I admit, been there, done that, I'll stick to Recruiting thank-you-very-much).
In my (never) humble professional opinion, it would be extremely difficult for a Recruiting effort to qualify as an example of Best Practice if it's reporting to HR.
Your thoughts?

