A full explanation is now included in my latest book ‘Professional HR. Evidence-Based People Management & Development’
You can also see a brief video of me doing my best to explain the subject on You Tube.
You could also start to get a better feel for the subject by visiting http://www.evidence-basedmanagement.com and in particular the ‘Five Principles of EBM’ or read Evidence-Based Management: Concept Clean Up Time
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