PADI presents each skill individually, in isolation. That skill is explained, demonstrated and then repeated by each student. Instructors are required to assess 'mastery' in that skill, before progression can (should) continue. Instructors are not permitted to deviate from (above or below) the performance standards for each individual skill - skills that are presented individually/in isolation. They may not impose additional performance standards other than what is defined explicitly in the instructor manual for the given skill.
A student might be asked to perform 'Skill X' either kneeling or hovering. That's fine. However, if they could not complete the skill appropriately because of the additional requirement of being in a hover, then the instructor couldn't fail that 'Skill X'... because more than 'Skill X' was being assessed.
Otherwise, what's to stop me adding higher requirements? Mask removal/replacement whilst deploying DSMB? If I 'felt' that was realistic application (as others feel hover is). The list goes on... until we reach absurd scenarios, where instructors might expect unrealistic performance from students. That's why PADI have global standards and strict performance requirements that instructors may not assess beyond...
Deploying an SMB and removing a mask are two separate skills, once of which is not even part of the OW course. An instructor who combines those two entirely separate skills the first time one (or more) of them is done would be doing something that is fundamentally unsound in terms of instructional theory. It happens to be the way my first tech instructor operated regularly, but it is fundamentally unsound. The reason for this in instructional terms is based on the idea of a
transfer load. New learning is essentially the application of old learning to new situations with new complications. If the leap to the new complication is too small, the student learns little and is bored. If it is too great, the student will fail. Good instruction manages the transfer load appropriately.
The PADI program progression you describe is designed with that in mind, adding new complications a little at a time. A partial mask flood is followed by a full mask flood and then mask removal and then mask replacement and then mask replacement combined with a no mask swim. Every element of the no mask swim should have been mastered before those skills are combined.
You earlier linked to an about.com article by Natalie Gibb about teaching horizontally. That article summarized an article in the PADI professional journal
(Undersea Journal) about open water instruction that focuses on an early start to buoyancy instruction. As the principal author of the article she was summarizing, let me remind you about its key points. In such instruction, buoyancy is the first skill addressed. All skills after that are done in horizontal posture while neutrally buoyant. Students go through the exact same progressions you mention, only they do it while neutrally buoyant. By the time they are doing the no mask swim and mask replacement exercise in CW #4, they have done every part of that exercise many times already.
At what level of skill do we expect them to do this? As has been stressed many times in this thread,
at the level expected of a student at that level of development. Do I fail the student whose fins touch the bottom while they are replacing the mask after the no mask swim or while replacing the BCD? Of course not--this is not tech instruction, and the student does not have to have the buoyancy control of a cave diver to succeed. Now, I wonder what I would do if a student said, "I have examined the PADI standards carefully. I have l read ScubaBoard, and people like DevonDiver and DCBC tell me I can insist on doing these skills anchored to the bottom rather than neutrally buoyant like my classmates. I insist that I be allowed to do this!" I suppose I will have to cross that bridge when I come to it. So far students just do what I tell them to do without any fuss.
Finally, let me remind you yet again, that
- the article mentioned earlier was published in the official PADI professional journal, the official publication that PADI sends to its instructors around the world;
- the article was co-written by Karl Shreeves of PADI, and one of his contributions to the article was the statement that if skills are introduced on the knees, they should be done neutrally later, hopefully within the same training session;
- and a member of the PADI staff told me (and his contact information is available on the Instructor to Instructor forum if you want to check) that the skills in the latter portion of the CW dives should be done neutrally.
As for the about.com article you cited above, I think I will talk with Natalie about a follow up article on this topic when we dive together in a couple of weeks. Maybe she can clarify this.