B) Performance evaluation checklist
A performance checklist containing 24 questions was designed to evaluate students’ skills in vaccination, which was completed 1 month after the intervention by one of the members of the research team in the form of observation for students both in the control and intervention group; The checklist for each question has 3 options “completely, somewhat, and at all”, if the relevant item is completed by the student, the option was "completely", if half of the relevant item was done, "somewhat" and if the relevant item is not done, the option was " at all". It was necessary to explain that by using Skype software, the student’s performance on the Marquette or doll was measured using real needles and vials.The face validity of the performance checklist was confirmed by the research professors. Reliability and validity of the questionnaires were performed by test-retest reliability and internal consistency. For this purpose, the internal correlation coefficient and Cronbach’s alpha tests were used, respectively. In the retest method in 2 stages 10 days apart, questionnaires were completed by 20 students with similar conditions. Retest coefficients between the obtained scores were calculated using ICC then values of 0.6 or higher were accepted [