An important factor in instrumental (operant) conditioning is the set of rules by which appropriate reinforcements are given for a behaviour. Read the passage below and identify the reinforcement schedule, justify your answer.

Ali is the manager at a fast-food restaurant. Every once in a while, someone from the quality control division comes to Alis restaurant. If the restaurant is clean and the service is fast, everyone on that shift earns a $20 bonus. Ali never knows when the quality control person will show up, so he always tries to keep the restaurant clean and ensures that his employees provide prompt and courteous service. His productivity regarding prompt service and keeping a clean restaurant are steady because he wants his crew to earn the bonus. (5 marks)