Development of a video-based evaluation tool in Rett syndrome.

Parents filmed their daughters with Rett syndrome at home. The team turned the clips into a checklist that scores eating, talking, hand use, and walking.

They asked 97 families to try it. Two raters watched the same videos to see if they agreed.

The checklist worked. Raters gave similar scores, so the tool is reliable. Parents said it felt fair and useful.

Doctors agreed the items matched real Rett features, so it has content validity.

Castañe et al. (1993) used short clinic clips and saw hand stereotypies that did not change with the room. Fyfe et al. (2007) widened the lens: home video plus parent help caught daily skills, not just stereotypy. The new tool extends the 1993 idea to everyday life.

Snyder et al. (2012) showed a 2-minute video MSWO can rank toys for kids with autism. S et al. prove the same medium can track movement and communication in Rett syndrome. Together they say, "Turn the camera on; just change the checklist to fit the goal."

Shabani et al. (2006) found 10-minute tic counts from video match long home watches. S et al. echo that brief, structured clips give trustworthy data even when the child has severe motor limits.

You no longer need to bring a girl with Rett to clinic for every baseline. Mail the parent a filming guide, score the clip, and you have valid data on four key domains. Use it before treatment, after treatment, or for remote re-assessment.