Tangible rewards are non-cash incentives that have a monetary value,
which can take a variety of forms, including trips, debit cards, gift cards or certificates, and merchandise. Goal theory predicts that once a goal is selected or assigned, it is more likely to have a positive effect on performance when individuals are committed to goal attainment (Locke and Latham 1990;Klein et al. 1999). Goal commitment is defined as ‘‘the determination to try for a goal’’.