The replication method proposed is based on an analysis of 12 complete and eight incomplete predynastic flint knives. From this a specific replication target was deduced, consisting of geometric parameters as well as quality standards for practical execution. The given replication technique, verified in more than 50 full replication experiments, ultilizes only common tools and all its elements remain within the frame of today's recognized flintknapping practice. What leads to the desired result is the right combination, the high precision and the extreme regularity of a great amount of simple but delicate steps. The Gerzean manufacturing sequence, as resulting from this study, consists of six basic stages and employs such different technologies as percussion, grinding, large pressure flaking, and micro-flaking. It is suggested that various kinds of people with separate skills were involved and that a very strong cultural pressure must have secured the extreme regularity of the final product quality. The perfection and the failures of the Gerzean craftsmen are described.