5Sweller J. Cognitive Load during Problem Solving: Effects on Learning [J]. Cognitive Science, 1988, 12(2): 257-285.
6Miller G A. The Magical Number Seven Plus or Minus two: Some Limits on our Capacity for Processing Information [J]. Psychological Review, 1956, 63(2): 81-97.
7Sweller J, Cooper G. The Use of Worked Examples as a Substitute for Problem Solving in Learning Algebra [J]. Cognition and Instruction, 1985, (2): 59-89.
8Zhu X, Lee Y, Simon H A, et al. Cue Recognition and Cue Elaboration in Learning from Examples [J]. Proceedings of the National Academic of Sciences of United States, 1996, 93(3): 1 346-1 351.