**7. Conclusion**

Finally, it is well known that the embryologist training would have a major bearing on the vitrification outcome. Further vitrification procedural improvements using postvitrification chemical treatment would reduce the high sensitivity of oocytes and embryos to cryopreser‐ vation and provide valuable information during an advanced postcryopreservation thawing procedure. Furthermore, the strategic placement of embryonic culture media is very important for a successful freezing/thawing process. This fact is often ignored, and we have determined that gentle appropriate treatment after thawing can improve survivability of human oocytes and embryos in much the same manner as witch model animals.
