Abbreviations such as asm, pa, psm, etc., are just fine. I also think it's acceptable to use abbreviations for schools in order to conserve space. For example, I reference KCPA-UIUC under the companies I've worked for, but I clarify if further under my education section as Krannert Center for the Performing Arts (KCPA) at the University of Illinois at Urbana Champaign (UIUC). There hasn't seemed to be questions in my interviews about where I did those shows.