Proximal stability is the key to control, safety and function. The seated position is not a position of stability for the human body, so when an individual must utilize a wheelchair for their primary means of mobility, it can be a challenge to successfully obtain/maintain proximal stability. Even postural asymmetries that appear to involve distal segments of the body, often can be attributed to instability or poor positioning of the pelvis. It is crucial to be able to assess the flexibility of these asymmetries and be able to properly recommended equipment that can aid in the correction or prevention of further mal alignment. This course will guide clinicians and ATP suppliers through the mat assessment process and provide intervention strategies to promote optimal pelvic and lower extremity positioning, thus improving safety and function for the end-user.