Clifford's lawn work is steady and up to standard as long as his work is verbally praised approximately every twelfth completed mower circuit…

Clifford's lawn work is steady and up to standard as long as his work is verbally praised approximately every twelfth completed mower circuit. However, at times the crew chief is unable to praise his work at that moment. When praise is not forthcoming, Clifford usually stops working. The best way to facilitate maintenance and generalization of Clifford's work, using a self-management technique, would be to: