Accoms vs. Mods

ACCOMMODATIONS vs. MODIFICATIONS 
for those with disabilities.

Accommodations are changes to the way things are typically done; they are changes in how a given requirement is met.

Modifications are changes to what must be done; modifications are changes to the given requirements. 

See this excellent 2012 presentation from ADEAD (Association for Higher Education and Ditsability): Accommodations vs. Modifications. What's the difference?