It is known that the surgical technique used to close the fascia in mid line laparotomies is an important parameter with regard to wound complications like wound infections and incision hernias. At this moment the best results in a prospective randomised clinical trial considering incisional hernia rates and wound infections, have been reported by the surgeons from the Sundsvall clinic in Sweden. Their technique using a suture to wound length ratio of at least 4/1 and using many small stitches will be described in the protocol as the "Principles Technique". We want to explore if these results can indeed prevent incision hernias significantly if implemented with training and tutoring.