The Collaborative Toolbox is a 'one-stop-shop' of resources created and curated by members of the Child and Youth Mental Health and Substance Use (CYMHSU) Collaborative, a partnership of Doctors of BC and the BC government. The Collaborative started in 2013 in the BC Interior with 200 people and eight Local Action Teams with the goal of improving access and care for children, youth and families facing challenges with mental health and substance use in BC. Since then the initiative has spread province-wide with 64 Local Action Teams, 11 system Working Groups, and over 2,600 people now involved.