NFPA 921 provides the foundational methodology for conducting fire and explosion investigations. This guide, developed by leading experts, outlines the scientific principles and systematic approach necessary for determining the origin and cause of fires and explosions. It details the entire investigative process, from initial scene examination and evidence collection to analysis and reporting, ensuring a rigorous and objective outcome.

As the leading consensus document for fire and explosion investigations, NFPA 921 is widely regarded as the authoritative guide for fire investigators, attorneys, and insurance professionals. Its comprehensive approach and scientific basis are critical for establishing the facts of an incident. The document's thoroughness and adherence to scientific methodology ensure its continued relevance and importance in the field.