“…Research with these measures focuses primarily on other factors (e.g., performance enhancement, physical endurance and pain tolerance) rather than the psychometrics of MT itself (Crust & Clough, 2005;. Existing MT scales include the Psychological Performance Inventory (Loehr, 1986), the Psychological Performance Inventory-A (Golby, Sheard, & vanWersch, 2007), the Mental Toughness Questionnaire (Clough et al, 2002), and two more recently published measures, the Sports Mental Toughness Questionnaire (SMTQ; Sheard, Golby, & Wersch, 2009) and the Mental, Emotional, and Bodily Toughness Inventory (Mack & Ragan, 2008). All are still in developmental stages, have limited psychometric support, and lack evidence of construct validity.…”