Source: Public Roads July/August 1999 Vol 63 no. 1 Federal Department of Transportation
Where found? Hathitrust
Search Term: "10% of what we read"
What was found? this chart:
We Retain:
10% of what we read.
20% of what we hear.
30% of what we see.
50% of what we hear and see.
70% of what we say, and
90% of what we say and do