The main purpose of the present study was to classify destinationbased factors affecting attracting tourists and their length of stay in Mashhad and provide interpretive structural modeling and clustering of these factors to assist tourism industry executives in this metropolis for optimal planning. A qualitative approach has been used to achieve this goal. Experts' opinions on the factors that could influence attracting tourists and their length of stay in Mashhad were collected through semistructured interviews and questionnaire distribution. MICMAC analysis is used to classify the elements and validate the interpretive structural model factors in the study to reach their results and conclusions. The results show that "legal and governmental, " and "managerial" aspects as driver factors have a great influence on "welfare, " "infrastructural, " "economical, " "socio-cultural, " and "marketing" ones as related factors.