15. The Research Base
- The Role of Research
- The Nature of the Research Literature
- Research Findings By Chapter and Section
View author’s reference(s)
Author: Heller, P.
- Heller, P., Ahlgren, A., Post, T., Behr, M., Lesh, R. (1989). Proportional reasoning: The effect of two context variables, rate type, and problem setting. Journal of Research in Science Teaching. 26, 205-220.