After the government lowered the practice of social distancing to Phase 1 nationwide, there have been daily discussions about the number of students per class over the possibilities of going to school in full scale. Getting ideas from this timely issue, this study paid attention to the learning environment of a Dure-type small school based on school clusters. During the period of transitional curriculums focused on here and how, they explored objectively the applicability of a program in the field at the level of action research by devising a common learning model and administering it in class lessons at a Dure-type small school based on the premise that small-sized schools would be important driving force in a new leap toward a new school model. As a result, the findings have the following implications: first, unlike the old common curriculums for a small school inclined toward entertainment and sports, the common learning programs based on hybrid learning environments at a Dure-type small school integrated subject areas with entertainment and sports around topics and thus provided students with opportunities to cultivate their transversal competencies ; secondly, the learning environment with inevitable limitations in group activities in terms of proper size used it as a chance for changes to practice the individualized curriculums through dynamic assessment activities among diverse students at a Dure-type small school; and finally, phenomenon-based learning in a common learning program at a Dure-type small school created a chance to convert the content and methods of teaching and learning to the direction of using and practicing knowledge of methods beyond the acquisition of knowledge of content and promote their management.