| Basically the PADI Professional progression goes like this:
DM - Dive Master
AI - Assistant Instructor
OWSI - Open Water Scuba Instructor (can train up to DM's)
MSDT - Master Scuba Diver Trainer (an OWSI with 5 specialty instrictor ratings and has certified 25 divers)
IDCS - Instructor Development Course Staff instructor (can also train AI's)
MI - Master Instructor (status only, need to have certified so many different divers to different levels)
CD - Course Director (can also train OWSI's and specialty instructors) |