Increasingly patients and parents of patients are included in medical decision-making and medical research. This is apparent the popular press, in funding agency guidelines such as the recent CIHR SPOR initiatives, and in collaborative doctor-patient treatment strategies. Patients are even receiving courses and certification in “patient engagement”. The need to inform patients and research participants is fundamental in clinical care and research. A fundamental question at the root of these endeavors is, how is information exchanged by medical professionals and patients? This presentation examines basic communication models encountered in clinician-patient interaction.