Prepare for a senior position as an office manager or executive assistant in industry and government with courses in accounting, communications, marketing, law, and management. Your diploma credits count towards completion of the Bachelor of Business Administration.<br>The Executive Assistant Diploma prepares office administration students to serve in more senior positions as office managers and assistants to senior executives in both industry and government. After completing the TRU Administrative Assistant Certificate in Year 1 or an equivalent office administration program from another institution, students take additional courses in accounting, communications, marketing, law, and management in Year 2.