Crossborder curriculum partnerships, entailing the transposition of an entire curriculum and the related degree(s) from "home" to "host" institution, are a rather new phenomenon in internationalization in education. The literature describes successful and unsuccessful partnerships, but critical factors for the success or failure of sustainable partnerships remain to be identified. We conducted a narrative literature review to find such factors. Using an iterative approach, we analyzed 39 articles retrieved from Web of Science, Google Scholar, ERIC, PubMed, and PsycInfo and meeting the inclusion criteria. We developed a framework of 13 factors in four domains: students, teachers, curriculum, and soft and hard project management. Simply copy-pasting a curriculum is generally considered to be destined for failure. To overcome challenges, partners should take preventive and affirmative measures across multiple domains. The findings may provide guidance to those considering or engaged in designing, developing, managing, and reviewing a crossborder partnership.