In order to meet the timetable set by the RCAF, Avro decided that Arrow program would adopt the Cook-Craigie plan . Normally a small number of prototypes of an aircraft were hand built and flown to find problems, and when solutions were found these changes would be worked into the design and then the production line would be set up. In a Cook-Craigie system, the production line was set up first and a small number of aircraft were built as production models.   Any changes would be incorporated into the jigs while testing continued, with full production starting when the test program was complete. As Jim Floyd noted at the time, this was a risky approach, however: "...it was decided to take the technical risks involved to save time on the programme... I will not pretend that this philosophy of production type build from the outset did not cause us a lot of problems in Engineering. However, it did achieve its objective."