In the first Chapter, Günter Faber examines the way in which academic self-perceptions significantly affect the educational performance of learners. Faber presents a study on the relations of students’ self-perceptions with their subjective explanations of grammar success and faiure. In the second chapter, María Fernanda Molina, PhD, Vanina Schmidt, PhD, and María Julia Raimundi, PhD explore the relationship between adolescents’ possible selves and the parental elevation of challenges. In the third chapter, Miguel Ángel Broc, PhD studies the Susan Harter model of academic motivation in the classroom. R. Constance Wiener, PhD and Alcinda Trickett Shockey discuss oral health self-perception in the fourth chapter. In the fifth chapter, Lindsay S. Meldrum, Diane E. Mack, PhD, and Philip M. Wilson, PhD study whether alteration in psychological needs fulfilment facilitates the correlation between moderate-to-vigorous physical activity and physical self-concept. In the sixth chapter, Merilyn Meristo, PhD present a study on university students’ motivation as it pertains to completing homework assignments.