The present study aimed to investigate the desirable assessment methods of the performance of the BA law students during internships, using a mixed methods research approach. The data was collected by using semistructured interviews and questionnaires. In the qualitative part of the study, interviews were conducted with 28 internship experts, lawyers, faculty members from the University of Isfahan, and graduate students, who were purposively selected. In the quantitative part, questionnaires were administered to 114 students from the academic year 2017-2018 and the graduates from 2014-2017 in the field of law. The results of the qualitative part of the study revealed that the interviewees emphasized the professor's assessment of student performance. The results of the quantitative part of the study revealed that "student performance in simulated settings" and "practical and diagnostic capabilities of students for dealing with client problems" are among the desirable assessment methods of the performance of the BA law students during internships.