If there is no point-to-point correspondence, then the prompt or probe is thematic, as would be the case if the supplementary stimulus was a non-verbal stimulus or an intraverbal stimulus.
A discriminative stimulus with the following features:
It is a supplementary stimulus
The person providing the supplementary stimulus can identify the response that the speaker is likely to emit
It is a supplementary stimulus
The person providing the supplementary stimulus cannot identify the response that the speaker is likely to emit
Whether the controlling relationship is formal or thematic
Who provides the supplementary stimulus (either another person or the speaker him or herself)