From the Challenger Report: If a change occurs late enough, it will have an impact on the serial processes. 1/
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Replying to @wycats
"In these cases, additional resources will not alleviate the problem," 2/
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Replying to @wycats
"and the effect of the change is absorbed by all downstream processes, and ultimately by the last element in the chain" 3/
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Replying to @wycats
"Once a particular process has started, if a substantial change is made to the flight," 4/
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Replying to @wycats
"but the process that preceded it and supplied its data may also need to be repeated. If one group fails to meet its due date," 5/
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Replying to @wycats
"the group that is next in the chain will start late. The delay then cascades through the system." 6/
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Replying to @wycats
TLDR: it's easy to claim that up-front "certified" design is "the right way" to do engineering, but that has never ever been true. 7/7
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Replying to @wycats
List of customer changes from the reportpic.twitter.com/EXtMaZSV0G
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