This studyaims to find outaboutthe influence ofindependent variableswithdependentvariables.(1)Interpersonalcommunicationand supervisionbyschoolprincipalsontheperformanceofteachersofSMP NegeriinSungaiApitDistrict.(2)Interpersonalcommunicationonthe performance ofteachers ofSMP Negeriin SungaiApitDistrict.(3) Supervisionofschoolprincipalsontheperformanceofstatejuniorhigh schoolteachersinSung…