Another common classification system is the Standard Industry Code (SIC). NAICS have mostly replaced the SIC, but the SIC is still used by some commercial databases. Finding and using these classification systems to effectively search can be tricky, so don't hesitate to ask a librarian for help.
Industry Canada and Statistics Canada are the two major sources of statistical data on Canadian industries. They both use North American Industry Classification System (NAICS), an industry classification system, to display data at levels of detail ranging from industry sector to discrete products.
Search or browse all NAICS or SIC codes on the NAICS Association website. Some NAICS codes are different in Canada — you can search by keyword or browse Canadian NAICS codes at Statistics Canada or Canadian Industry Statistics. To search for a SIC code using a NAICS code and vice versa, use the NAICS & SIC Crosswalks.
For more information about planning your industry research, including identifying your industry codes, check out the video tutorial for Module 3: Planning Your Industry Research.