%A NIM.: 17101040029 Dhia Sauzan %O Pembimbing: Dr. Syifaun Nafisah, S.T., MT %T PENGARUH USABILITY TERHADAP LOYALITAS PENGGUNA APLIKASI IPUSNAS KALANGAN MAHASISWA ILMU PERPUSTAKAAN UIN SUNAN KALIJAGA YOGYAKARTA %X This study aims to 1) determine the usability level of the iPusnas according to users among Library Science students at UIN Sunan Kalijaga; 2) determine the loyalty of iPusnas users among Library Science students at UIN Sunan Kalijaga; 3) determine the effect of usability on the loyalty of users of the iPusnas among Library Science students at UIN Sunan Kalijaga. This research is descriptive quantitative research with a correlation study. The sample used in this study amounted to 68 library science students at UIN Sunan Kalijaga who use iPusnas. The results showed that: 1) the usability of the iPusnas according to users among Library Science students at UIN Sunan Kalijaga was high with a grand mean value of 2.96; 2) the loyalty of users of the iPusnas among Library Science students at UIN Sunan Kalijaga is high with a grand mean value of 2.97; 3) there is a positive and strong relationship between usability and loyalty of iPusnas users among Library Science students at UIN Sunan Kalijaga (positive r count is 0.608) and from the results of a simple linear test it is known that usability affects loyalty by 37%, if the usability variable increases 1 % there will be an increase in the loyalty variable of 0.240. The results of the hypothesis test (t-test) sig 0.000 <0.05, then there is a significant influence between usability and loyalty. The author suggests that the error correction in the search feature of the iPusnas is more optimized. %K Usability, Loyalitas, Aplikasi iPusnas. %D 2021 %I UIN SUNAN KALIJAGA YOGYAKARTA %L digilib48154