There are two supplemental tests in the 2010-2011 Rulebook:
TR 25.13 Intermediate Supplemental Moves in the FieldMay be taken after passing the intermediate moves and/or the adult gold moves in the field tests
1. Forward and backward crossovers (see preliminary pattern 1)
2. Forward circle 8 (see preliminary pattern 5)
3. Forward and backward perimeter power stroking (see pre-juvenile pattern
1)
4. Backward circle 8 (see pre-juvenile pattern 5)
5. Eight-step mohawk sequence (see juvenile pattern 3)
6. Spiral sequence (see intermediate pattern 2)
7. Forward twizzles (see intermediate pattern 4)
One element may be retried, if necessary.
Passing Total Passing Average
Standard 22.4 3.2 / Adult 21.0 3.0 / Masters 19.6 2.8 (Approximate time for test: 15 minutes)
Judging panel required: Three silver or higher rank singles/pairs or dance judges who are certified to judge moves in the field tests
JUDGING FORM:
https://www.usfsa.org/Content/JP_MF-Intermediate-Supplemental.pdfTR 25.14 Senior Supplemental Moves in the FieldMay be taken after passing the senior moves in the field test
1. Inside three-turns/rocker-choctaws (see novice pattern 1)
2. Forward loops (see novice pattern 4)
3. Backward twizzles (see novice pattern 6)
4. Backward loop pattern (see junior pattern 5)
5. Straight line step sequence (see junior pattern 6)
6. Spiral sequence (see senior pattern 2)
7. Serpentine step sequence (see senior pattern 5)
One element may be retried, if necessary.
Passing Total Passing Average
Standard 31.5 4.5 / Adult 30.1 4.3 / Masters 28.7 4.1 (Approximate time for test: 15 minutes)
Judging panel required: Three gold singles/pairs or dance judges who are certified to judge moves in the field tests
JUDGING FORM:
http://www.usfsa.org/Content/JP_MF-Senior-Supplemental.pdfThe Supplemental tests incorporate the new/revised patterns from the tests at or below the current test level. I believe they're optional, meaning if a skater has passed Intermediate prior to 9/2010, they can take the Novice test without passing the supplemental test.
On the USFSA's part, these are an effort to bring every skater up to the same levels since it was felt that these patterns improved the skater's skills in ways that the older tests did not, although the revised patterns were mainly done to save time during testing.
Some skater-coaches I've spoken with have said that these tests would help prepare themselves as coaches to teach their students the patterns. Experience is the best teacher, so to speak. Others have said it's a challenge that they'd enjoy preparing for, already having completed all of the standard-track Moves tests.
The tests also provide a bit of validation for skaters who advanced before the 2010 patterns were effected: there was a lot of chatter about "getting the tests in before the changes" because the skaters couldn't pass the new patterns. Frankly, I think of that rush as more "We've been studying/practicing these patterns for a year, so we should just finish and start the next level with the 2010 patterns." Going back to nail these supplemental tests removes any stigma by demonstrating that the skater can/has completed the same requirements as later test-passers.
I think a deciding factor would be expense: if a skater has already tested to Junior, their lesson/test fees would be better spent focusing on passing Senior instead of going back to do remedial work.