ICSI (Intracytoplasmic sperm injection) - Formation of embryo by directly injecting sperm into the ovum IUI (intrauterine insemination) -Artificial introduction of semen into the vagina or uterus IUT (Intra uterine transfer) - Transfer of embryo with more than 8 blastomeres into the uterus GIFT (Gamete intra fallopian transfer) - Transfer of ovum collected from a donor into the fallopian tube where fertilization occurs ZIFT (Zygote intra fallopian transfer) - upto 8 blastomeres) into a fallopian tube.