This is a Lexicon entry: the mechanism, when it shows up, and the countermeasure. The full correction, with real-world cases and the audit prompt, hasn't been written yet.
Definition
A phenomenon where pre-existing knowledge blocks the ability to find an optimal solution to a new problem - the first solution that comes to mind inhibits finding a better one.
When it shows up
Facing a problem that resembles one you have solved before. Returning to a skill after a long gap. Any moment when a practised approach springs immediately to mind for a new situation. Modern context: A machine learning engineer approaches every new problem with a neural network architecture that worked well on their last project - even when the dataset size, label noise and latency requirements make a simpler model obviously better. The successful prior solution is blocking the search.
Failure mode
The familiar solution occupies the mind's working slot and suppresses generation of alternatives. Better solutions that would be easily found by a novice are not considered because the path to them is blocked by the practised path.
Countermeasure
When a solution arrives quickly, pause before committing. Ask: 'What would I try if I had never seen this problem before?' Force a second candidate solution before evaluating the first. When correction costs more than the bias: When the familiar solution is actually optimal. Prior experience selects for solutions that worked; defaulting to them is often correct. The Einstellung effect is only a problem when the current situation genuinely requires a different approach - which requires first establishing that the familiar solution is inadequate.
Related traps
Also connected in the map7 more, locked
Credit & first seen
DiscoveredLuchins, A.S. (1942).Mechanization in problem solving: The effect of Einstellung.Psychological Monographs 54(6) source ↗
Also revealed
Entry #19 of 631 in The Lexicon · see the full Lexicon