Methods: A descriptive quantitative research study was conducted with 670 students and 90 lecturers from 11 faculties at UIN Jakarta. The student samples consisted of 270 men and 400 women, while lecturer samples consisted of 44 men and 46 women. Data were collected via interviews and a perceptual questionnaire consisting of 54 items scored on a 4-point Likert scale. Data were analyzed with descriptive statistics, a t test, and confirmatory factor analysis. Findings: Although both students and lecturers had positive perceptions of the concept of the integrated curriculum, the students' perceptions were more favorable than the lecturers'. Problems encountered during the implementation of the integrated curriculum included the absence of clear guidelines for implementing the integrated curriculum, the lack of lecturers' competencies to implement the integration in learning processes, the lack of specific nomenclature about the integration concept, and limited time allotted to learning Islamic studies in the natural sciences program. Implications for Research and Practice: Few obstacles have hindered the successful implementation of the integrated curriculum throughout the faculties at UIN Jakarta. The findings have informed the development of a blueprint and clear guidelines for implementing an integrated curriculum that other Islamic institutions of higher education in Indonesia and other countries can use to deliver integrated studies.