Control charts 控制图 Monitors variation in data a Exhibits Trend- Make Correction Before Process is Out of control Show When Changes in Data Are Due to a Special or Assignable Causes Fluctuations Not Inherent to a Process Represents Problems to be Corrected Data Outside Control Limits or Trend a Chance or Common Causes o Inherent Random variationsControl Charts 控制图 • Monitors Variation in Data  Exhibits Trend - Make Correction Before Process is Out of control • Show When Changes in Data Are Due to  Special or Assignable Causes ⚫ Fluctuations Not Inherent to a Process ⚫ Represents Problems to be Corrected ⚫ Data Outside Control Limits or Trend  Chance or Common Causes ⚫ Inherent Random Variations