ABSTRACT
Professionalism is a multidimensional quality acquired over time. Undergraduate years lay a foundation for the development of professionalism. Tools monitoring the students' professional development are needed. Our tool development followed three phases: 1) identifying meaningful criteria for professionalism adapted to the education level, 2) developing an evaluation instrument in a process maximising construct validity, 3) testing the evaluation instrument in an interprofessional study. The evaluation instrument proved to be applicable in the field and it meets validity standards. Some differences between professions were found and discussed. Professionality starts to develop during the education, and early monitoring is important to support students' optimal development. The evaluation instrument supports both self- and expert evaluation of healthcare students' professional development.