SCIENCE PROCESS SKILLS
Many scholars have written about process skills. Among these, the view articulated by Gagne has been the most influential. In his theory of learning structure - learning hierarchy and learning prerequisite - Gagne (1965) submitted that the prerequisite knowledge for the concepts and principles in the hierarchy could be obtained only if the students have acquired certain underlying capabilities. These capabilities he called intellectual skills or science processes which, according to Gagne (Gagne, 1965), are needed by students to practice and understand science.