“We always talk about the four ‘c’s of improv: creativity, critical thinking, collaboration and communication,” says Deana Criess, director of ImprovBoston’s National Touring Company, about how she teaches the form to seventh-graders. To persuade students to abandon their fear of mistakes, she insists on unconditional support to all answers, then works to build trust among the group and invite risk-taking. “Once we have confidence in our ideas and in our teammates, we can free ourselves up to have fun,” she says. “So support, trust, risk, confidence and fun. That’s what improv is all about,” Criess says.