Many fast$-$food restaurants compete on lean business practices. Match each of the following activities at a fast$-$food restaurant with the lean business concept it strives to achieve. Some activities might relate to more than one lean business concept.

Updated menu items

Orders filled within three minutes

New product development

Helpful managers

Continuous improvement $($CI$)$

Customer satisfaction surveys

Just$-$in$-$time $($JIT$)$

Employees trained in food safety techniques

Total quality management $($TQM$)$