In this study, I attempted to make a One Page Portfolio sheet (OPP sheet) for extracurricular school sports club activities based on the accumulated research on One Page Portfolio Assessment (OPPA) Theory. The results clearly showed the OPP sheet for extracurricular school sports club activities require the following four components: (1) "sheet name" to be filled in by the students themselves based on "activity breaks" such as meetings and competitions; (2) "essential questions before and after the learning" to examine "students' thoughts and wishes about extracurricular club activities" and identify the transformations caused by activities; (3) "activity record" to have the students write "what they think is the most important at the club activity"; and (4) "self-evaluation" to have them reflect on what has changed and how it has changed throughout "the activity breaks", and how they feel about it.
