Entry level CAD operators would not be expected to possess the necessary knowledge to complete a drawing without input from an engineer. When a drawing is initially completed a print is generated and given either to the CAD Manager or the engineer for review and mark up. If errors or omissions are found, or design changes are warranted, the mark up will be returned to the CAD tech in order for the drawing to be revised. This back and forth process will occur until such time as the CAD Manager or engineer is satisfied at which point the final version will be printed.