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.
Teach the concepts.
Objective: To teach the concepts they need to understand functions.
Activity: Teach the following concepts: Domain; Range; Cartesian Product and Graphing; Relation; Rule of Correspondence; Function: Definition of, Notation, How to Recognize from a Graph, Ordered Pair, Preimage (input), Image (output).
