“…For those not familiar with the answer-until-correct format, a scratch-off card is used for the answer sheet. The correct answer is indicated by a star, and an incorrect answer is indicated by a blank space. , Based on the literature, ,,− the advantages of the answer-until-correct format are (1) the students know their grades immediately; (2) there is partial credit, i.e., instructors can give various amounts of credit depending on the number of boxes scratched off per answer; and (3) most importantly, the students get immediate feedback about what they know and what they do not know.…”