The Instructor Development Course (IDC) is made up of two parts - the Assistant Instructor (AI) course and the Open Water Scuba Instructor (OWSI) program. Complete the entire IDC and go on to attend an Instructor Examination (IE), which is the final step to earn a PADI Instructor certification. Instructor Examination (IE) is a two-day evaluative program that tests an instructor candidate's teaching ability, dive theory knowledge, skill level, understanding of the PADI System, and attitude and professionalism. PADI IEs are standardized and conducted by specially trained PADI Instructor Examiners.