National Council Teachers of Mathematics (NCTM). (2000). Principles and standards for school mathematics. Reston, VA: NCTM.
National Research Council (NRC). (1996) National science education standards, Washington DC: National Academy Press.
Newell, A., & Simon, H. (1972). Human problem solving. Englewood Cliffs, NJ: Prentice-Hall.
Rittle-Johnson, B., & Alibali, M. W. (1999). Conceptual and procedural knowledge of mathematics: Does one lead to the other? Journal of Educational Psychology, 91(1), 175-189.
Rittle-Johnson, B., Siegler, R. S., & Alibali, M. W. (2001). Developing conceptual understanding and procedural skill in mathematics: An iterative process. Journal of Educational Psychology, 93(2), 346-362.
Ropohl, G. (1991). Deficiencies in engineering education. In P. T. Durbin (Ed.). Critical Perspectives on Nonacademic Science and Engineering. Research in Technology Studies, Vol. 4. London and Toronto: Associated University Press.
Sigel, I. E. (1983). Is the concept of the concept still elusive or what do we know about concept development? In E. K. Scholnick (Ed.). New trends in conceptual representation: Challenges to Piaget’s theory? Hillsdale, NJ: Lawrence Erlbaum.
Skolimowski, H. (1991). The eco-philosophy approach to technological research. In P. T. Durbin (Ed.). Critical Perspectives on Nonacademic Science and Engineering. Research in Technology Studies, Vol. 4. London and Toronto: Associated University Press.
Smith, P. C. (2006). Essential aspects and related academic concepts of an engineering design curriculum in secondary technology education. Unpublished doctoral dissertation. University of Georgia, Urbana-Champaign.
Supovitz, J., & Turner, H. (2000). The effects of professional development on science teaching practices and classroom culture. Journal of Research in Science Teaching, 37(9), 963-980.
Tennyson, R. D., & Cocchiarella, M. J. (1986). An empirically based instructional design theory for teaching concepts. Review of Educational Research, 56(1), 40-71.
Vincenti, W. G. (1990). What engineers know and how they know it: Analytical studies from aeronautical history. Baltimore, MD: Johns Hopkins University Press.
Welch, M. (1999). Analyzing the tacit strategies of novice designers. Research in Science & Technological Education, 17(1), 19-34.
Wicklein, R. C. (2006). Five good reasons for engineering design as the focus for technology education. The Technology Teacher, 65(7), 25-29.
Williams, P. J. (2000). Design: The only methodology of technology?” Journal of Technology Education, 11(2), 48-60.
Winner, L. (1977). Autonomous technology: Technics-out-of-control as a theme in political thought. M.I.T. Press, Cambridge, MA.
Wordnet. Definitions of core on the web, Retrieved March 14, 2009, http://wordnet.princeton.edu/perl/webwn.