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And in Improvisation there is one hard and fast rule, and that rule is known as "Yes And." The term YES AND: to say yes, and not just yes, but to add information. In the adding of information you don't negate the other persons idea - but you build on it.

"Maya Rudolph's Commencement Speech is Fantastic - 'Create Your Own Destiny'". Maya Rudolph's commencement address to the students of Tulane University in New Orleans, Los Angeles, onmogul.com. May 16, 2015.
And in Improvisation there is one hard and fast rule, and that rule is known as Yes And. The term YES AND: to say yes, and not just yes, but to add information. In the adding of information you don't negate the other