Juan is using Ebbinghaus' retention curve technique.
The reduction in memory retention over time is predicted by the forgetting curve, also known as Ebbinghaus' retention curve. This curve illustrates how information deteriorates over time when no effort is made to keep it. The strength of memory is a related idea that describes how long memory traces last in the brain. It demonstrates how learnt knowledge gradually fades from our minds unless we take steps to keep it there. For instance, if your company has 10 customers at the beginning of the year and loses two of them, your retention rate is 80%.
Three different methods—recall, recognition, and relearning—are used by researchers to gauge forgetting and retention.
To learn more about Ebbinghaus' retention curve, here
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