Co-facilitation involves two or more people facilitating a meeting or group process together in a cooperative manner. They should plan together by dividing roles and tasks. They also need to decide on communication strategies, when they can interrupt each other, and how to provide constructive feedback. After the session, co-facilitators should evaluate each other's performances jointly. Effective nonverbal communication techniques for co-facilitators include using hand signals to check the time, indicate how things are going, or give feedback on keeping to the topic or pace.