Link to Qualtrics: Survey making platform like surveymonkey. Use your purdue id.
The Standard Industrial Classification (SIC) is a U.S. system for classifying industries by a 4-digit code. In most cases it is being replaced by the more recent 6-digit North American Industry Classification System (NAICS). Many databases will let you search by SIC and/or NAICS code, so it can be helpful to know the code(s) for the industries you are interested in.
SIC Code & NAICS Code Conversion Tables