Don't ask a systems thinker for advice on managing performance or staff engagement.  They will probably say something pretty fruity and you'll wind up frustrated by how fervently they trash conventional wisdom on the subject.  Of course performance, engagement, recruitment, they're all connected, so your systems thinking friend will sound like a fruit loop because they'll see the whole picture and proceed to suggest that you are asking the wrong questions, when all you wanted to know is "how to get people to do stuff".