The WCIRB conducts research to assist in the formulation of proposed changes to the Insurance Commissioner’s regulations. Classification research studies are presented to the WCIRB's Classification and Rating and Governing Committees, and may be included in a WCIRB regulatory filing submitted to the California Insurance Commissioner for approval. Below are reports from the past 10 years.

2021

• Report on the Carnivals and Circuses Study (May 18, 2021)
• Report on the Tile and Cabinet Stores and Stone Material Dealers Study (May 18, 2021)

2020

• Report on the Hospitality and Resort Industry (October 13, 2020)
• Report on the Iron or Steel Erection Study (October 13, 2020)
• Report on Multiple Enterprises Rule and Interchange of Labor Study (October 13, 2020)
• Report on the Study of Assignments to Standard Exception Classifications (April 14, 2020)
• Report on Extension of Payroll Limitations (February 11, 2020)

2019

• Report on the Cotton Farms and Batting Study (October 15, 2019)
• Report on Hardware Stores and Hardware Dealers Study (May 7 and May 30, 2019)
• Report on Cotton Merchants and Warehouse Study (May 7, 2019)
• Report on the Review of Dual Wage Classification Thresholds (May 7, 2019)
• Report on the Hotel/Motel Industry Study (May 7, 2019)
• Report on Cider Manufacturing Industry Study (March 19, 2019)
• Report on Aircraft Industry Ticket Sellers and Information Clerks Study (January 22, 2019)
• Report on Ice Manufacturing, Ice Dealers, Creameries and Dairy Products Manufacturing Study (January 22, 2019) 
• Report on Wrecking or Demolition and Building Raising or Moving Special Industry Classification Procedures Study (January 22, 2019)
• Report on Non-Electronic Instrument Mfg. Study (January 22, 2019)

2018

• Report on Private Schools Study (Revised August 24, 2018)
• Report on Glaziers Dual Wage Threshold Study (May 8, 2018)
• Report on Grading and Paving Industry Study (May 8, 2018)
• Report on Brewery, Winery and Distillery Study (March 20, 2018)
• Report on Payroll-Remuneration: Equity-based Compensation Plans Study (March 20, 2018)
• Report on Salvage Material Dealers Industry Study (March 20, 2018)
• Report on Aircraft Charter Study (January 23, 2018)
• Report on Telecommunications Study (January 23, 2018)

2017

• Report on the Study of Unmanned Aircraft Systems/Aerial Drones (June 1, 2017)
• Report on the Study of Athletic and Fitness Instruction, Exercise Facilities, Clubs and Baths (April 25, 2017)
• Report on the Study of Retail Video Media, Audio Media and Book Stores (April 25, 2017)
• Report of the Study of Dual Wage Thresholds (April 24, 2017 and June 1, 2017)
• Report of Standard Exception Classifications (March 14, 2017)

2016

• Report on the Health and Human Services Industry Study (May 10, 2016 and June 2, 2016)
• Report on the Property Management/Operation Industry Study (May 10, 2016)

2015

• Report on Horse Racing (June 10, 2015)
• Report on the 2015 Study of Dual Wage Thresholds (May 5, 2015)
• Report on Gas Works and Waterworks (May 5, 2015)
• Report on Marine Appraisers or Surveyors and Inspection for Insurance or Valuation Purposes (May 5, 2015)
• Report on Supply Dealers (May 5, 2015)
• Report on the Installation of Tile, Stone, Mosaic or Terrazzo Work (May 5, 2015)

2014

• Report on the Refuse Collection Industry (May 13, 2014)
• Report on Leasing Agents in the Property Management Industry  (May 13, 2014)
• Report on Mobile Food Vending Operations (March 18, 2014)
• Report on Contractors — Executive Supervisors (March 18, 2014)
• Report on Wiping Cloth or Rag Dealers (January 7, 2014)

2013

• Report on Mining and Quarries (October 22, 2013)
• Report on Magnetic Tape Manufacturing (October 22, 2013)
• Report on Electrical Apparatus and Electric Appliance Manufacturing (October 22, 2013)
• Report on Farmers’ Markets and Amusement Parks or Exhibitions (July 23, 2013)
• Report on Retail Dry Cleaning or Laundries, Commercial Laundries and Dry Cleaning or Dyeing (June 14, 2013)
• Report on the 2013 Study of Dual Wage Thresholds (June 14, 2013)
• Report on Dual Wage Construction or Erection Classifications Time Card Verification of Hourly Wage (June 14, 2013)
• Report on Concrete Sawing or Drilling Industry (June 14, 2013)
• Report on the Dual Wage Threshold Painting Industry (March 5, 2013)

2012

• Report on the Comprehensive Evaluation of California’s Dual Wage Classifications (August 15, 2012)
• Report on Concrete Dam Construction (July 31, 2012)
• Report on Commercial Dry Cleaning or Dyeing and Retail Dry Cleaning or Laundry (July 31, 2012)
• Report on Newspaper, Magazine or Book Publishing and Newspaper Publishing or Newspaper Printing (June 13, 2012)
• Report on Stock Farms and Stables (June 13, 2012)

2011

• Report on Commercial and Residential Carpentry and Steel Framing (July 25, 2011)
• Report on Parcel Delivery Companies and Trucking Firms (July 25, 2011)
• Report on Timber Cruising, Oil or Gas Geology and Geophysical Exploration (July 25, 2011)
• Report on Newspaper Delivery Employees (June 1, 2011)
• Report on Racing Stables (June 1, 2011)

2010

• Report on Consulting Engineers (September 13, 2010)
• Report on Welfare Funds (July 27, 2010)
• Report on Bed Spring or Wire Mattresses Mfg. (July 27, 2010)
• Report on Automobile or Automobile Truck Radiator Mfg. (July 27, 2010)
• Report on Fruit or Vegetable Dehydrating and Packaging (June 9, 2010)