From the article: "If the design has been verified and if a thorough test program has been completed it should not be necessary to make any changes. Of course,

From the article: "If the design has been verified and if a thorough test program has been completed it should not be necessary to make any changes. Of course, this idealized situation does not exist in any program like Apollo where design, test, and flight often overlap and must be carried out at the same time." Wow, these remind me of the Joint Strike Fighter program, where design/test/production all overlapped (concurrency) and cost overruns where a huge issue. No doubt, we spared very little expense in the Apollo program, cutting only the last two missions!