Product Market Matrix
This term is derived from marketing. It is a handy means to qualify and quantify end-users of tactile images (and their intermediaries or supporters).
Age
- young children (development age 2-6?)
- students 7-11 and 12-16 (?)
- (young and old) adults
Vision
- early / late blind or partially sighted?
Environment/setting
- home / school / museum