Provide "acknowledged body of knowledge" related to the concept. Emphasize the most significant aspects of the concept in an organized, organic manner. Present information sequentially so students see continuity. Draw attention to important, discrete details; don't swamp students with myriad facts.

Define exchange and bartering

Objective: To define bartering.

Activity: Teacher lesson defining bartering as trading. Discussion with students as to when bartering works and when it does not. If available locally, play excerpts from a radio "swap shop" program.

Assessment: Verbal checking for understanding and student contributions to the lesson.