Table 3 Operational Definitions and Measurement Criteria for Response Types

Response type	Operational definition	Included in independent mand data
Independent mand	A vocal request for the target item emitted within 5 s under motivating operation (MO) conditions without verbal questions, models, or prompts.	Yes
Prompted response	A correct vocal response emitted following a visual prompt,partial vocal prompt, or full vocal prompt.	No
Incorrect response	An incorrect item name, echolalic response, irrelevant vocalization, orany vocal response other than the target response.	No
No response	No vocal response emitted within 5 s following the response opportunity.	No