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There seemed to be no end to the insights that could be offered under the banner of thinking outside the box.
In other words, the difference could easily be due to what statisticians call sampling error.
He challenged research subjects to connect all nine dots using just four straight lines without lifting their pencils from the page.
Today many people are familiar with this puzzle and its solution.
Overnight, it seemed that creativity gurus everywhere were teaching managers how to think outside the box.
Management consultants in the 1970s and 1980s even used this puzzle when making sales pitches to prospective clients.