Although mosaic embryo transfer is currently offered as an option for women who undergo IVF, several concerns remain, especially regarding clinical outcomes of mosaic embryos. We aim to increase the currently limited data surrounding mosaic embryo transfer by collecting prospective and retrospective data on mosaic embryo transfer and its prenatal and postnatal outcome. We also hope to promote the formulation of an evidence-based priority scheme for mosaic embryos in the clinic. Finally, we strive to provide guidance and networking opportunities to PGT centres.