Course Substitutions If you don't see your course listed here, submit a course inquiry. California State University, Chico AGED 420: Techniques in Vocational Agricultural InstructionApproved Course Title Vocational Education Requirement Type Preliminary Program Single Subject Agriculture Philosophy and organization of vocational education, with particular reference to educational principles for agriculture commerce, home economics, and industry. NOTE: This course may be taken as an undergraduate or during the credential year.