IMPLEMENTASI METODE WATERFALL DAN SYSTEM USABILITY SCALE TESTING PADA APLIKASI FISIOTERAPI PASIEN BPJS. j. inti nm [Internet]. 2024 Jul. 10 [cited 2026 Apr. 3];19(1):31-9. Available from: https://ejournal.nusamandiri.ac.id/https:/ejournal.nusamandiri.ac.id/index.php/inti/article/view/5571