For open water diver you need a total of 4 open water scuba dives, PADI allows a maximum of 2 open check out dives in one day. (edenrockdive.com)
At DJL Diving, on Koh Tao Thailand, we've put together a number of different PADI Instructor Packages, so you can decide if you'd like to train as an PADI Assistant Instructor PADI Open Water Scuba Instructor, PADI Master Scuba Diver Trainer [MSDT] or a PADI Staff Instructor. (davyjoneslocker.asia)
PADI Divemaster is the prerequisite certification for both the PADI Assistant Instructor and PADI Open Water Scuba Instructor certifications. (bigjohnscuba.com)