Please choose ONE from the following schedules:

Fixed Ratio, Variable Ratio, Fixed Interval, Variable Interval, Multiple Schedule, Chained Schedule, Mixed Schedule, Tandem Schedule, Alternative Schedule, Conjunctive Schedule.

Mr. Harrison is an elementary teacher whose students are particularly attention-seeking. Many often disrupt the class when trying to obtain Mr. Harrison's attention. He has decided to hang a purple sign when his attention to the students is available, and an orange sign when his attention to the students is not available. Schedule of Reinforcement: