How is The Original IDEX CA Class© organized? The 51 lessons are distributed as follows: Lessons 1 to 29 – Codes and Regulations Lessons 30 to 45 – Business and Ethics Lessons 46 to 51 – Fundamentals of Interior Design jennifer King2017-03-02T22:34:09+00:00 Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInTumblrPinterestVkEmail