The technique of episiotomy.
Episiotomy is frequently performed, with an incidence of 70-80 per cent in someunits, but is still often poorly executed and repaired with  little thought as to the importance of a supple pain-free scar.
D000772:Anesthesia, Local; D000773:Anesthesia, Obstetrical; D004841:Episiotomy / Q000379:methods*; D005260:Female; D006801:Humans; D049590:Postpartum Period; D011247:Pregnancy; D013997:Time Factors