critically describe the teacher’s actions in thebefore, during and after phases of a problem-solving lesson. competently select and design effective problem-based lessons from the textbook and other resources. explain competently how problem-solving goals are developed while students learn 2.2.4. Unit four: Planning in the problem-based classroom` After studying this unit, you should be able to: describe the step-by-step process of planning for a problem-based lesson. write out a well thought out and concise lesson plan based on a problem-based strategy. critically discuss some variations of the three-part lesson. discuss how workstation activities or games can be profitably and meaningfully used to enhance a problem-based lesson. discuss the effective use of group work. explain the differences between competitive learning, individualistic learning and collaborative learning. discuss the effective use of collaborative/cooperative learning.