Sophian, C., & Crosby, M.E. (1998, August). Ratios that even young children understand: The case of spatial proportions. Paper presented at the meeting of the Cognitive Science Society of Ireland, Dublin, Ireland.
Strauss, S., & Bichler, E. (1988). The development of children’s concepts of the arithmetic average. Journal for Research in Mathematics Education, 19, 64–80.
Streun, A.V., Harskamp, E., & Suhre, C. (2000). The effect of the graphic calculator on students’ solution approaches: A secondary analysis. Hiroshima Journal of Mathematics Education, 8, 27–10.
Sutherland, R. (1993). Symbolising through spreadsheets. Micromath, 10(1), 20–22.
Sutherland, R., & Rojano, T. (1993). A spreadsheet approach to solving algebra problems. Journal of Mathematical Behavior, 12, 353–383.
Sutherland, R., Jinich, E., Mochón, S., Molyneux, S., & Rojano, T. (1996). Mexican/British project on the role of spreadsheets within school-based mathematical practices (Final report to the Spencer Foundation, Grant No. B-1493). Chicago: Spencer Foundation.
Swafford, J.O., & Langrall, C. (2000). Grade-six students’ preinstructional use of equations to describe and represent problem situations. Journal for Research in Mathematics Educational, 31, 89–112.
Tarr, J.E., & Jones, G.A. (1997). A framework for assessing middle school students’ thinking in conditional probability and independence. Mathematics Education Research Journal, 9, 39–59.
Thompson, A.G., Philipp, R.A., Thompson, P.W., & Boyd, B.A. (1994). Calculational and conceptual orientations in teaching mathematics. In D.B.Aichele & A.F.Coxford (Eds.), Professional development of teachers of mathematics (1994 Yearbook of the National Council of Teachers of Mathematics, pp. 79–92). Reston, VA: NCTM.
Thompson, P., & Thompson, A. (1987). Computer presentations of structure in algebra. In J.C.Bergeron, N.Herscovics, & C.Kieran (Eds.), Proceedings of the Eleventh International Conference for the Psychology of Mathematics Education (vol. 1, pp. 248–254). Montreal: University of Montreal. (ERIC Document Reproduction Service No. ED 383 532 ).
Tversky, A., & Kahneman, D. (1974). Judgment under uncertainty: Heuristics and biases. Science, 185, 1124–1131.
Usiskin, Z. (1988). Conceptions of school algebra and uses of variable. In A.F.Coxford & A.P. Shulte (Eds.) The ideas of algebra, K-12 (1988 Yearbook of the National Council of Teachers of Mathematics, pp. 8–19). Reston, VA: NCTM.
Usiskin, Z. (1998). Paper-and-pencil algorithms in a calculator-and-computer age. In L. J.Morrow & M.J.Kenney (Eds.), The teaching and learning of algorithms in school mathematics (1998 Yearbook of the National Council of Teachers of Mathematics, pp. 7–20). Reston, VA: NCTM.
Van Hiele, P.M. (1984a). A child’s thought and geometry. In D.Fuys, D.Geddes, & R. Tischler, English translation of selected writings of Dina van Hiele-Geldof and P.M.van Hiele (pp 243–252). Brooklyn: Brooklyn College. (Original work published 1959).
Van Hiele, P.M. (1984b). The problem of insight in connection with school children’s insight into the subject matter of geometry. In D.Fuys, D.Geddes, & R.Tischler, English translation of selected writings of Dina van Hiele-Geldof and P.M.van Hiele (pp. 237–241 ). Brooklyn: Brooklyn College. (Original work published 1957).