Can you trust the web? Dale's pyramid debunked?

Quite often percentages of remembrance are assigned to activities like reading, seeing, hearing, ... These are often incorporated into graphics like Dale's pyramid.

In his blogpost Will at Work Learning: People remember 10%, 20%...Oh Really? tries to follow up on the evidence for these percentages. And there seem to be none! The same result can also be found in the Cisco report: Multimodal Learning Through Media: What the Research Says.

Too bad, the percentages were just great in an argument. Wouldn't it be great to have a well designed study giving evidence for percentages like that?

Taking new results from the neurosciences on neuroplasticity, it might even be impossible to find evidence for any common percentages.

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