<prompt> Translate the following text to EnglishMchakato wa majaribio ya kubuni ulijumuisha ukaguzi wa muundo katika hatua maalum za muundo kama vile asilimia 15, 30 na 60 ya kukamilika kwa muundo.  <response>: Some processes were formal, incorporating design reviews at specific design milestones such as at 15, 30, and 60 percent of design completion. 