Most California employers are aware of the WCIRB, often called “the Rating Bureau” or simply “the Bureau.” The WCIRB issues workers compensation experience modifications and conducts periodic on-site inspections, following which it assigns workers compensation insurance classifications. Most employers probably think of the WCIRB as a state agency (some actually refer to it as “the state”), but this is incorrect. The WCIRB is a private association of which all California-licensed workers compensation insurance companies are members.