CONSIDER these for:
Users who demonstrate skills indicating readiness for aided symbol systems: discriminating between visual symbols, using symbols to make requests for things they want, using more robust or novel nonverbal forms of communicating (e.g. vocalizing gesturing, head nods/shakes, taking a partner to something, looking at something)
Have been using pictures and/or iconic symbols which appears to increase both comprehension and expression.
Attempts to communicate using aided systems are most frequent in motivating situations or favorite activities