Design and Development of a Customer Satisfaction Measurement Information System for the Sahabat Daya Universitas (SDU) Program at PT. BTPN Syariah Using the SERVQUAL & Importance-Performance Analysis (GAP) Method. JURTIK [Internet]. 2023 Dec. 1 [cited 2026 Nov. 14];12(2):1-12. Available from: https://journal.stmik-bandung.ac.id/index.php/jurtik/article/view/131