Third, providing models using aided AAC changes the input by slowing down the communicationprocess (Hustad & Beukelman, 2000). This slower input rate provides the listener with greater processing time, and the additional stress placed on the input may also assist the listener (e.g., the instructor slowly says and emphasizes the words tiger blow while pointing to TIGER and BLOW). Thus, a variety of factors may have contributed to the success of the intervention for four of the five participants. Clearly, further research is required to investigate the relative impacts of each of these variables on the acquisition of early symbol combinations for young children using AAC.