The simple answer is, as many as it takes. We don’t release patterns until we are absolutely certain they are ready for sale. We run internal testing among the members of our team before approaching a limited number of testers in each size group for pretesting. Once pretesting is over, we run one large test of 30-40 testers. If we feel there are still issues with the pattern, an additional round of testing will be done. Testers are often required to sew the pattern multiple times in each testing round.
Last Update: April 6, 2017