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.

2022

• Report on the Review of Computer and Computer Peripheral Definitions (August 9, 2022)
• Report on the Standard Exception Study – Automobile or Truck Dealership Vehicle Salespersons (August 9, 2022)
• Report on Not Otherwise Classified (N.O.C.) Study – Clubs (August 9, 2022)
• Report on Extension of Payroll Limitations (May 17, 2022)
• Report on the Newspaper Delivery Study (May 17, 2022)
• Report on the Study of Computer Programming in the Electronics Manufacturing Industry (February 1, 2022)

2021

• Report on the Review of Dual Wage Classification Thresholds (October 26, 2021)
• Report on the Food Packaging and Processing – Container Manufacturing Study (October 26, 2021)
• Report on the Standard Exception Study (September 22, 2021)
• Report on the Mining Study (September 22, 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 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 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 Concrete Sawing or Drilling Industry (December 17, 2014)
• Report on Dual Wage Construction or Erection Classifications Time Card Verification of Hourly Wage (December 17, 2014)
• Report on the Dual Wage Threshold Painting Industry (December 17, 2014)
• Report on Farmers’ Markets and Amusement Parks or Exhibitions (December 17, 2014)
• Report on Dual Wage Thresholds: 5190/5140, Electrical Wiring; 5183(1)/5187(1), Plumbing; 5183(2)/5187(2), Refrigeration Equipment; 5538/5542, Sheet Metal Work (December 17, 2014)
• Report on Magnetic Tape Manufacturing (December 17, 2014)
• Report on Mining and Quarries (December 17, 2014)
• Report on Electrical Apparatus and Electric Appliance Manufacturing (December 17, 2014)
• Report on Retail Dry Cleaning or Laundries, Commercial Laundries and Dry Cleaning or Dyeing (December 17, 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)