Gross Motor Function Classification System (classification system that describes the gross motor function of children and youth with cerebral palsy) is a 5-level evaluation system (table 2) on the basis of their self-initiated movement that differentiates children cerebral palsy in terms of their gross mobility, the limitations in their gross functionality and their need for assistance.
GMFCS applies to four age groups:
less than 2 years old
2-4 years old,
4-6 years old and
6-12 years old.