Eka Farra Dewi Sitompul; Sukaria Sinulingga; Fadli; Sugih Arto; Syafrizal Helmi. EVALUATION OF THE EFFECTIVENESS OF THE IMPLEMENTATION OF SERVICE STANDARD POLICIES ON SERVICE QUALITY IN THE CALIBRATION LABORATORY OF THE TESTING AND TESTING UPT MEDAN GOODS QUALITY CERTIFICATION. IJEBAS 2026, 6, 584-590.