Industry is related to Business. Firm is a type of Business. 
you are likely to find Confusion in/at/on Class. Class is related to Education. Person wants (to) Education. Researcher is a type of Person. 
Industry <--RelatedTo--> Business <--IsA-- Firm 
Confusion --AtLocation--> Class <--RelatedTo--> Education <--Desires-- Person <--IsA-- Researcher 