What kind of schedule involves two or more component schedules for one response, with only one schedule active at a time?

The term that describes a situation where two or more component schedules are employed for a single response, with only one schedule in effect at any given moment, is a multiple schedule. In a multiple schedule, each component schedule is paired with a specific stimulus or cue that signals which schedule is currently active. This allows for clear differentiation between responses based on the associated schedule.

For instance, if a student is reinforced under a fixed ratio schedule when a red light is on and under a variable interval schedule when a green light is present, the student will respond differently depending on the schedule that is currently active. This approach is useful in educational settings to teach different behaviors or tasks systematically.

Concurrent schedules, on the other hand, involve two or more schedules that are available simultaneously for the response, not alternating between them. Fixed and variable schedules refer to specific types of reinforcement schedules that do not incorporate the component structure highlighted in the question.