You are the Quality Control Engineer for a company that manufactures handheld electronic devices. The company produces 200 devices every week and your inspectors inspect 5 randomly selected devices every week. The inspection consists of several performance requirements (screen clarity, responsiveness, audio, etc) as well as cosmetic requirements (scratches, damage, labels etc) You decide to implement SPC charting to monitor the Quality of the product over time. Which type of chart is appropriate?