The document discusses thinking, reasoning, and problem solving. It provides definitions of thinking from various scholars and defines it as a pattern of behavior that uses internal representations like symbols to solve problems. It describes the nature of thinking and different types of thinking like perceptual, conceptual, reflective, creative, and associative. For reasoning, it provides definitions and notes it involves purposeful and controlled thinking. Types of reasoning discussed are inductive and deductive. Finally, it outlines the scientific method of problem solving as involving problem awareness, understanding, information gathering, formulating solutions, selecting a solution, and verifying the solution.