“…By using the number of full-time employees, labor costs, number of rooms, the hotel area (square meters), the book value of assets, operating expenses, the external cost of input items and turnover, number of tourists, and accommodation revenue as output items, Barros (2005) used the CCR model of DEA to explore the efficiency of 43 hotels in the Pousadas de Portugal chain group of Portugal in 2001. According to the findings of the study, most hotels have production efficiency, and technical efficiency is 90.9% in the case of constant returns to scale; in variable returns to scale, technical efficiency is 94.5%.…”