Fig. 1.

Correct responding to verbal models presented by the interventionist during baseline and during the orienting cue intervention. Data points represent communication probes for the three children. The arrows indicate different milestones made by the three children during the communication probes. Phoneme represents the first correct phoneme produced in response to a verbal model; Word represents the first full word produced in response to a verbal model; and Independent refers to the first session where words were produced that were not immediately preceded by a verbal model