Scratching is a method of rejuvenating the endometrial lining through its mild injury. Using microsurgical scissors, we carve the inside of the fundus of the uterus in order to activate growth factors that favor the implantation of the fetus. Scissor scratching is superior to simple endometrial disruption using a pipelle. It is performed at least 2 cycles before the scheduled treatment protocol. The above have been published by our team in highly regarded human reproduction journals.