Dianne Russell & Marilyn Wright 
GMFM (GMFM-66 & GMFM-88) User’s Manual, 2nd edition [PDF ebook] 

What is the GMFM? The Gross Motor Function Measure (GMFM) is a clinical measure designed and validatedto evaluate changes in the gross motor function in children with cerebral palsy (CP). There are two versions of the GMFM: the original 88-item measure (GMFM-88) andthe 66-item measure (GMFM-66). These items are administered in the same way thedifference between the two versions simply concerns which of the items (from the fullpool of 88 possible items) are included in GMFM-66. There are three methods of administering the GMFM to obtain a GMFM-66 score. Allthree methods require the Gross Motor Ability Estimator (GMAE-2) scoring software toconvert the item data into a GMFM-66 score. Administration methods include the following:(1) GMFM-66: administer all 66 items; (2) GMFM-66-Item Sets (GMFM-66-IS): usea scoring algorithm to identify a subset of items to administer; and (3) GMFM-66 Basal &Ceiling (GMFM-66-B&C): use a basal/ceiling approach to identify a subset of items.Items on the GMFM-88 span aspects of what the World Health Organization s International Classification of Functioning, Disability and Health refers to as gross motor activity , ranging from activities such as lying and rolling to walking, running andjumping skills. The GMFM-66 consists of a subset of the 88 items that has been shown to be unidimensional.