“…In other words, just as expected, within groups, self-reported conscientiousness is reliably, strongly, and positively related to a wealth of objective, quantifiable, concrete, and meaningful correlates. For instance, the positive association between job performance and conscientiousness (Digman 1989;Smith 1967;Wiggins et al 1969;Viswesvaran et al 1996;Salgado 1997;Tett et al 1991) holds across various occupations, such as professionals, police, managers, and sales, whether measured by performance ratings, productivity data, training performance ratings, salary level, turnover status change, or tenure (Barrick and Mount 1991). This shows that conscientiousness, an internal personality trait, does reliably relate to external, measurable success.…”