The at various levels, following a top-down sequence.
The evaluator starts by supporting the trunk at a high level, at the shoulder girdle to assess cervical (head) control, through support at the axillae (upper thoracic control), inferior scapula (mid-thoracic control), lower ribs (lower thoracic control),
below ribs (upper lumbar control), pelvis (lower lumbar control), and finally, no support, in order to measure full trunk control.