Years ago, Larry Tesler, then a vice president of Apple, argued that the total complexity of a system is a constant: as you make the person’s interaction simpler, the hidden complexity behind the scenes increases. Make one part of the system simpler, said Tesler, and the rest of the system gets more complex. This principle is known today as “Tesler’s law of the conservation of complexity.” Tesler described it as a tradeoff: making things easier for the user means making it more difficult for the designer or engineer.”
– Don Norman, Living with Complexity, quoted in this blog post.
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