For beginners who may be reading this thread (and for parents of beginners who are trying to make sense out of all the new information at the early stages) also recommended is the 7-video series recently (2018) created in collaboration between PSIA national and Halley O’Brien, with Eric Lipton. These 7 videos are largely consistent with the 3 Armstrong videos. Ms. Armstrong notes that her 3-video presentation is only one sequence for obtaining desired results, and presumably she knew of the PSIA/O’Brien/Lipton videos, some of which are found at
https://www.thesnowpros.org/take-a-lesson/beginners-guide-to-skiing
If Armstrong video #3 is due a criticism, it may be that Ms. Armstrong could have told viewers that the next stage of this student’s instruction would be to develop separation and counter in her turning. Many beginners have extreme difficulty with the notion of counter and separation, and going into that would have made the third video too long. Separation and counter warrant a separate video. It seems to me that the student (Tuesday) is now at that point, at the end of video # 3.
With respect to the # 3 PSIA/Lipton video
Getting around the Mountain, it introduces wedge turns to a beginner in a more brief but similar manner to Armstrong's introduction.
and
http://www.halleyobrien.com/beginners-guide-to-skiing-youtube-series
Video # 4,
Three Key Moves for Your First Day, is at
Video #5,
Making Your First Turns, is at
#5 shows stepping turning (“100” steps) for anyone who is interested in trying an initial part of a version of what is sometimes called a direct-to-parallel progression (that is, not based on the wedge position), provided that the beginner area has enough gentle terrain. Subsequent parts of that kind of progression are not shown, presumably to keep the video short. Also not shown is the prerequisite work leading up to the student's ability to step through a turn. Compare the wedge turn in video # 3.
Video # 6,
What to Wear, is at
Video #7,
How to Get Off the Chair Lift, is at
Recognizing that much is not shown, things that will be taught in other lessons -- such as separation and counter, this series of 7 videos can be recommended to beginners.
PSIA national, if monitoring this thread, might consider adding videos # 4, 5, 6 and 7 to the PSIA website where # 1, 2 and 3 can be found.
(Note to exam candidates. Mr. Lipton demonstrates the Braking Wedge at 1:41 in video # 3. Perhaps this constitutes official sanction of the disputed Braking Wedge, at least as of 2018 – the date of the video!)