“…However, these studies had three main methodological weaknesses: lack of control groups (Cohen-Mansfield et al, 1997;Hagen & Sayers, 1995); reliance on staff ratings rather than objective observations (Hagen & Sayers, 1995;Hillman et al, 2001;Moniz-Cook et al, 1998); and interventions with multiple components so it was not possible to identify which was effective (Opie et al, 2002;Proctor et al, 1999;Rovner et al, 1996). Hawthorne effects cannot be discounted as residential and nursing homes are often isolated places for staff to work (Sival, Albronda, Haffmans, Saltet & Schellekens, 2000), as noted in the Rowan Ward Report (Commission for Health Improvement, 2003).…”