Few authors provided details on how many tokens they chose to make available, the rates at which students used tokens, or the specific methods by which instructors tracked tokens. However, the few examples provided do give useful guidance for instructors considering implementing a token system in their course. Hunter et al. suggest determining the number of tokens to provide by counting the number of high stakes assignments and adding one . Vitale and Concepción suggest a similar approach -providing tokens that correspond to the number of high stakes assignments plus or minus one .