“…Jennings, Yarrow, and Martin (1984) developed measures of mastery motivation that consist of three dimensions: producing effects, practicing skills, and persistence at solving difficult problems at 1 year of age, and curiosity, task orientation, and persistence at difficult tasks at three and half years of age. Messer et al (1986) Vlachou and Farrell (2000) measured dimensions of object mastery motivation: task pleasure, task persistence, success, and off-task behavior.…”