 At the very least, this suggests the field of prevention should further examine the efficacy of this ... approach by conducting independent, rigorous, controlled, longitudinal studies..."

Since at least 2008 peer-reviewed professional journal articles on its effectiveness have been published.See C.L.Polsfuss, A.Ardichvili articles in "Organizations and Business" section below.In their writings about HR, authors Roger Mills and Elsie Spittle note several kinds of objections to it.