We live in Sydney. My dd has experienced very basic assessments and 'eye balling' during ballet school auditions (associate program). They were conducted by dance teachers - not physio's - before the barre work began.
To understand your child's facility (current and potential), I highly recommend an ongoing relationship with a dance physio. For example, as part of my dd's pre-pointe assessment she went to a dance physio who put her through a very thorough testing session. The report provided measurements against norms and a list of exercises for her to work on before returning for re-testing. The report was sent to her school and this information dictated when and whether a student could start pointe work. It is the norm that students visit the physio on an on-going basis e.g. if no issues it is to get new excercises to help with their continual improvement.
Here is a rough list of the categories in the Report: Spine (leg lengths, signs of scoliosis, pelvic alignment, low back mobility and control, and abdominal control), Pelvis (control during single leg squat and hopping tasks), Hips (turnout potential – passive and active ranges, flexibility of hip flexor and gluteal strength), Hamstrings (flexibility, kneecap alignment and flexibility, knee active hyperextension), Plie range, Ankles (active pointe range mobility), Feet (big toe dorsiflexion, arches and presence of bunions), Balance (quiet balance), and Hypermobility Assessment