This paper examines how Piaget, Werner, and Gardner differ regarding the roles of cognition, intelligence, and learning in the developmental process. Piaget believes in the predominance of genetic factors. Werner stresses the influence of biological factors, while Gardner proposes that the environment plays a greater influence in how intelligence and learning are acquired. This paper also surveys research on achievement and learning strategies and their role in student motivation. The development of conceptual understanding is related to prior knowledge, interest, learning goals, and achievement goals.