This Foundational Document, initiated by the Institute for Catastrophic Loss Reduction (ICLR) and sponsored by the Standards Council of Canada (SCC), is a first step toward creating a comprehensive methodology (i.e., best practices) for WUI fire exposure and impact case studies in Canada. Such studies are vital to address outstanding knowledge deficiencies and improve mitigation measures that reduce structural vulnerability, ignition and loss. This document is not a prescriptive plan, but rather a backgrounder exploring what a comprehensive methodology might look like. It addresses scientific, operational and administrative aspects of implementing WUI fire case study research and provides a focal point for further discussion. In preparing this document, the authors clearly recognize that the trust and support of key stakeholders are required for such an initiative to move forward.