Clinician Rated Outcome. The Alberta Infant Motor Scale (AIMS) is a standardised observational examination tool used to assess the maturation of gross motor skills of infants from term (i.e. 40 weeks gestation) to 18 months post-term. The AIMS was developed as a reference guide for the development of infants based on the age-related norms of 2200 infants in Alberta, Canada.

It can be used as a screening tool to detect and track early developmental delays. It compares a child’s level of motor development against the expected norms for their age in four categories: prone, supine, sitting and standing.

The AIMS is a 58-item observational scoring tool. These items are divided into four position-centric sub-scales:

1. Prone (21 items)
2. Supine (9 items)
3. Sitting (12 items)
4. Standing (16 items)