The author looks at both strengths and weaknesses in this body of work, highlighting pitfalls and paradoxes in research procedures and providing valid design models. This includes the contribution ofdedicated meta-analyses to this controversial field and a discussion of the benefits and limitations associated with this type of research. Substantial data, drawn from three extensive studies (Felix, 2005a, b; Felix, 2006a), allows the author to present for the first time synthesized findings relating…
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