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Although, IUI is one of the most frequently used fertility treatments worldwide insemination with and without ovarian stimulation and cycle-monitoring (timed intercourse) are only included in very few large national and international data collections on ART monitoring. . IUI is easy accessible, low tech, cheap and patient friendly and is efficient in the treatment of unexplained infertility and mild to moderate male factor infertility. Yet, another indication for IUI is in addition to ovulation induction in women with anovulatory infertility. The European IVF-Monitoring Consortium (EIM), an institution of the European Society of Human Reproduction and Embryology (ESHRE) has collected data on IUI since 1997. This chapter comprises a definition of MAR and an overview of the worldwide current MAR monitoring. Moreover, we discuss the importance of including MAR and IUI in the ART monitoring programs to assess the full quality and safety of fertility treatments.