Okay, let’s tackle this. So Roberto has skills in Supply Chain Management, Six Sigma, and Lean Manufacturing, which are in demand. However, his role and location are in the San Diego Metropolitan Area, which might be considered a mid-tier market. According to national averages, Six Sigma professionals with similar skills can charge around $75-$125 per hour. Considering his certification and experience, I'll estimate his rate to be on the lower end of this range, around $75 per hour.