“…Among 6 quantitative studies, only 1 study was based on correlational study using inferential statistics. This shows that little empirical research has been conducted on this practice (Kampa-Kokesch & Anderson, 2001;Kilburg, 1996Kilburg, , 1997Kilburg, , 2001Orenstein, 2002;Sherman & Freas, 2004), even if there are a number of case studies portraying successful instances of executive coaching (e.g., Diedrich, 1996;Kiel, Rimmer, Williams, & Doyle, 1996;Peterson, 1996;Tobias, 1996).…”