Are you already a Padi Divemaster? Then continue your dive career with the second step. It is time to start your Padi Instructor Development Course (IDC). The IDC consists of two sections, the Assistant Instructor (AI) course and the Open Water Scuba Instructor (OWSI) program. This structure lets you divide the course into two blocks for schedule convenience if you need to. However, you may prefer to complete the two portions together, going through the entire IDC in as few as nine days.