Variable-Interval Schedule
Also called: VI schedule, VI
Definition
A schedule in which the first response after a varying, unpredictable amount of time is reinforced, with the intervals averaging a set value. It produces moderate, steady responding without the pause-and-burst pattern of a fixed interval, and it is a common choice for maintaining behavior in natural settings.
In plain language
After an amount of time that changes unpredictably, the next response is rewarded. Behavior stays moderate and steady.
Example
A supervisor drops in at unpredictable times and praises staff found running the program correctly.
Not variable-interval schedule
Praise delivered on a timer every ten minutes whether or not the behavior happened. With no response requirement, that is a time-based schedule.
Commonly confused with
See also
Written from
- ferster-skinner-1957
Written from Ferster and Skinner (1957). No textbook glossary consulted.
This entry has not yet been through clinical review. Treat it as a draft.