The purpose of this paper is to demonstrate methods for developing cognitive processes in adult students. It discusses concept formation and concept attainment, problem solving (which involves concept formation and concept attainment), Bruner's three stages of learning (enactive, iconic, and symbolic modes), and visual thinking. A curriculum for logical thinking is described that would make the processes of concept formation and concept attainment visible by incorporating the visualizing of solutions to problems. Suggestions for a curriculum for logical thinking include encouragement of students' working in pairs or small groups on problem solving and concentration on the process of the reasoning, not the response. Samples of types of problems used in a curriculum for logical thinking follow. Solutions are provided for each exercise. These types of problems appear: concentration, visualization, abstraction, Venn diagrams, pattern seeking, analogy, verbal analogies, inductive reasoning, and charting. (YLB)