If someone asks you what time it is, and it is five o’clock, your verbal response “five o’clock” is controlled by both the visual stimulus of the position of the hands on a clock and by the prior mand for the correct time.
A situation with the following features:
There is a single response form
The response is simultaneously strengthened by two or more controlling variables
Response topography
The type of controlling variable (stimulus or establishing operation)
The specific number of multiple variables
Whether or not the current response is followed by reinforcement