In this terrific interview at Google, Tina Fey explains one of the basic rules of improv (starting at around 2:46). Fey describes how actors and actresses use the "yes, and" rule in improv comedy. In other words, you are trained to build on others' ideas. Accept what they have said, and take the idea further. Do not reject what someone has said. Eliminate the "yes, but" mentality that can derail a sketch. The "yes, and" rule is instrumental for teams in the workplace too. It can help make brainstorming sessions more effective, and it keep debates constructive.