Teamwork Shared Mental Models (SMM) reflect the teams’ understanding of its members’ roles and interactions. This mixed-methods study examined teamwork-SMMs during discharge and described the differences of discharge teams with higher versus lower teamwork-SMMs. Teams with better teamwork-SMMs during discharge were more likely to report similar understanding of the patient’s situation, open communication and exchange of information, and team cohesion and resulted in more effective care delivery. Poor team-SMMs were characterized by divergent opinions regarding patient care plans, delays or gaps in communication, and team members operating independently and in isolation from their team.