Health literacy (HL) is a person’s ability to practically apply a wide range of cognitive and non-cognitive skills, to make health-related decisions. This study, that involved Can-Change Chair Dr. Kim Lavoie, endeavored to develop a comprehensive, function-based tool that adequately and accurately measures HL skills of this patient population. Involvement of patients from initial stage allowed us to develop a tool that will serve as a first ever developed HL tool for asthma and COPD patient group.