The Magical Number Seven
The human short-term memory can hold about 7 items (plus or minus 2) at once.
This cognitive limit, proposed by George Miller in 1956, suggests our working memory can process roughly 5 to 9 chunks of information simultaneously. It happens because our brain groups details into meaningful units to manage complexity. For example, remembering a phone number is easier when broken into three chunks like 555-123-4567.
Recognising a definition is not the same skill as spotting it.
Two scenarios from the app, with distractors drawn from the same family of biases — which is what makes them hard.
When giving directions to her new apartment, Lena says: 'From the highway, take Exit 5, pass the Shell station, turn left at the big oak tree, go straight past the park, then it's the yellow house on the right.' She forgets to mention the final street name.
During a job interview, Sam is asked to describe his last role. He lists his first few responsibilities fluently, then pauses and says, 'And... other project management duties,' unable to detail the rest.
Biases rarely arrive alone.
Understand more. Assume less.
188 biases, 18,869 scenarios, and a record of how you actually decide.
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