xiContents
14. Internal Audits ............................................................................................ 179
Overview ....................................................................................................... 179
Types of Audits ............................................................................................ 180
Performing an Audit ................................................................................... 182
Product Audit .......................................................................................... 183
Process Audit ...........................................................................................184
Layered Audit ..........................................................................................188
Error-Proong Audit .............................................................................. 193
General Comments about the Audits ....................................................... 193
References ..................................................................................................... 196
Selected Bibliography ..................................................................................197
15. Poka-Yoke ..................................................................................................... 199
Overview ....................................................................................................... 199
Historical Perspective ..................................................................................199
Strategy of Mistake Proong ......................................................................200
Mistake-Proof Systems ................................................................................202
Essentials of Poka-Yoke ............................................................................... 204
Zero Defect Concept in Mistake Proong ................................................ 210
Poka-Yoke Steps and Application .............................................................. 210
Approaches to Correcting Human Mistakes ........................................... 213
Red Flag Conditions .................................................................................... 220
Corrective Action ......................................................................................... 221
Presenting Findings.....................................................................................224
Next Steps .....................................................................................................225
References .....................................................................................................225
Selected Bibliography .................................................................................. 226
16. Measurement System Analysis (MSA) ..................................................227
Overview .......................................................................................................227
Types of Data ................................................................................................ 229
Using Minitab
®
.............................................................................................230
MSA: Gauge R&R .................................................................................... 230
Attribute MSA: Using Minitab
®
............................................................235
Variable MSA: Using Minitab
®
.............................................................. 241
Conducting the Study ........................................................................ 241
Trials and Data Collection ................................................................242
Manipulate the Data ..........................................................................242
Prepare the Analysis ..........................................................................243
Choose a Method of Analysis...........................................................244
MSA Graphical Six Panel ..................................................................245
Minitab
®
Graphical Output ..............................................................245
What to Look For ....................................................................................253
Repeatability Issues (within Operator) ...........................................253
Reproducibility Issues (between Operators) ..................................253