The plan required considerable confidence in the design from the outset; if the design had an inherent flaw, the jigs used during pre-production would have to be replaced. The plan seems inherently more dangerous than the traditional prototype cycle, but Cook and Craigie argued that for the advanced designs that were entering service in the late 1940s, any prototype was likely to be so different from the production variant that any data collected could be entirely misleading.
The plan required a strong belief in its design from the beginning; if there were flaws, the jigs used during pre-production would have to be changed. The plan seems riskier than the traditional prototype cycle, but Cook and Craigie argued that for advanced designs entering service in the late 1940s, any prototype would likely be so different from the final product that data collected would be unreliable.