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―118―JournalofChubuUniversityEducationNo.17（2017）PracticeReportabouttheTeachingEffectivenessbyCumoc:FocusontheKaizenProcessfor8YearsTERAZAWAAsako＊＊Professor,DepartmentofManagementSynthesis,CollegeofBusinessAdministrationandInformationScience,ChubuUniversityAbstractThisisapracticereportonlecturesusingCumoc,ChubuUniversityMobileClickerSystem.Afterclarifyingtheteachingeffectsoftheclickerfromthepreviousresearches,thisreportintroduceshowCumochasbeenusedinthelargeclassesfor8years.Mainlymulti-choicequestionswereusedforroleplay,reviewandgraspingthestudents'levelofcomprehension,whilefree-entryfieldswereusedtointakestudents'opinionsandquestions.ObviouslythemethodologyandfrequencyofCumoc'susageshouldbechangedaccordingtotheclasscontent,thoughCumocisaneffectivetoolforclassimprovement.ThisreportalsodescribesthatatrialusingCumoctothepreviewofthelecturein2017increasesthetimeavailableofself-studyofthestudents.KeywordsCumoc,Clicker,Classimprovement,Self-studytime