On the topic of problem solving,
“My own thinking on this subject has been deeply influenced by Lin Wells, who teaches strategy at the National Defense University. According to Wells, it is fanciful to suppose that you can opine about or explain this world by clinging to the inside or outside of any one rigid explanatory box or any single disciplinary silo. Wells describes three ways of thinking about a problem: “inside the box,” “outside the box,” and “where there is no box.” The only sustainable approach to thinking today about problems, he argues, “is thinking without a box.”
From the book Thank You for Being Late: An Optimist’s Guide to Thriving in the Age of Accelerations by Thomas L. Friedman.