2.2 Cognitive Development 2.2.1 Cognitive Development in Adolescence 2.2.2 Early Adolescence 2.2.3 Middle Adolescence 2.2.4 Late Adolescence 2.3 Piaget’s Theoretical Approach on Cognitive Development 2.4 Information Processing Perspective 2.4.1 Information Processing 2.4.2 Information Processing Theory 2.4.3 Information Processing Model 2.5 School Performance and Cognitive Development