Symbol-and-arrow diagrams are helpful adjuncts to equations derived from pharmacokinetic models. Both show relationships among dependent and independent variables. Diagrams show only qualitative relationships, but clearly show which variables are dependent and which are independent, helping students understand complex but important functional…

Classroom teachers need to make sound judgments and decisions concerning curricular and instructional issues. The teachers who wish to become more effective in the classroom should learn to develop their own research designs since educational research reported in journals is often inconclusive, conflicting, or not relevant to the classroom…