Usability Evaluation of the Academic Information System at Universitas Battuta Using the System Usability Scale

Abstract

This study evaluated students’ perceived usability of the Academic Information System
(SIAKAD) at Universitas Battuta using the System Usability Scale (SUS). A quantitative
descriptive survey was conducted through student SIAKAD accounts at the beginning of the
2025/2026 academic year. Participation was optional, resulting in a voluntary response sample
of 300 active students. The questionnaire comprised the ten standard English SUS statements
rated on a five-point agreement scale. All responses were complete and were analysed using
standard SUS scoring, descriptive statistics, and Cronbach’s alpha. The mean SUS score was
74.78, with a sample standard deviation of 6.38, a median of 75.00, and a range of 55.00–
87.50. The mean falls within Grade B of the Sauro–Lewis Curved Grading Scale. However,
Cronbach’s alpha was 0.0041, indicating very low internal consistency and substantially
limiting the interpretation of the aggregate score. Consequently, the numerical grade provides
insufficient support for a firm conclusion about overall perceived usability. The findings
indicate a need to examine questionnaire comprehension and verify response coding before
the score informs institutional decisions. Further evaluation should combine questionnaire
assessment with task-based observation or interviews, while addressing the limitations
associated with voluntary participation.