1 Also known as the path-of-least-resistance principle and principle of least effort.

2 The seminal works on performance load are Cognitive Load During Problem Solving: Effects on Learning by John Sweller, Cognitive Science, 1988, vol. 12, p. 257–285; “The Magical Number Seven, Plus or Minus Two: Some Limits on Our Capacity for Processing Information” by George Miller, The Psychological Review, 1956, vol. 63, p. 81–97; and Human Behavior and The Principle of Least Effort by George K. Zipf, Addison-Wesley, 1949.

3 “Frustrations of a Pushbutton World” by Harold Thimbleby, Encyclopedia Britannica Yearbook of Science and the Future, 1992, p. 202–219.

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