Training programs focused on professional learning and development are meant to provide teachers with opportunities to develop their professional competencies for teaching in specific domains. These programs represent an important branch of the educational system in Romania. In the study that we have initiated we have tested and validated the hypothesis that identifying professional training needs and offering specific courses in order to develop the professional competencies represents a key condition for teachers’ effectiveness in terms of their professional learning and development. The methods and instruments for educational research that we used in the present study are both qualitative and quantitative, based on questionnaires, individual interviews and focus group interviews. The reason why we opted for the mixed methods is because quantitative research throughout questionnaires does not always allow participants to explain their choices or the meaning of the questions. The quantitative survey was carried out on a non-probabilistic sample (770 teachers) and the focus groups were conducted with groups of 10 randomly selected respondents from the training program. All the teachers participating in our study are from pre-university education and have participated in continuing education programs accredited by the Department of Educational Sciences of the Faculty of Psychology and Educational Sciences.