Dr. David Aikin’s Laws are true: “Engineering is done with numbers. Analysis without numbers is only an opinion. Not having all the information you need is never a satisfactory excuse for not starting the analysis. Space is a completely unforgiving environment. If you screw up the engineering, somebody will die (and there’s no partial credit because most of the analysis was right).” Remember the motto of the Mission Evaluation Room: “In God We Trust, All Others Bring Data.” Don’t be persuaded with arm-waving or specious arguments lacking foundation in first principles.