Abstract
Commercial agriculture is appriached by diverse views. Applying both approaches of input and output views, case studies at three upland communes (Quang Thach, Trung Hoa and Hoa Son) shows that commercility at household level is rather high in both input and output sides. However, it is much lower and high variation in input side rather than output side. Different wealthy levels of househodls leads to diferent commerciality.