<prompt> Translate the following text to EnglishKiwango muhimu cha uthabiti wa kubuni ilikuwa makubaliano ya wadau kwamba michoro ya uhandisi ilikuwa kamili na kuungwa mkono na kupima na prototyping wakati inahitajika.  <response>: A key measure of design stability was stakeholders agreements that engineering drawings were complete and supported by testing and prototyping when necessary. 