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Supplement to Chapter 17 Statistical process control (SPC) 531 Control limits for the range chart (R) were calculated as follows: UCL = D 4 × A = 2.282 × 6 = 13.69 LCL = D 3 A = 0 × 6 = 0 After calculating these averages and limits for the control chart, the company regularly took samples of four bottles during production, recorded the measurements and plotted them as shown in Figure S17.9. The control chart revealed that only with difficulty could the process average be kept in control. Occasional operator interventions were required. Also the process range was moving towards (and once breaking) the upper control limit. The process seemed to be becoming more variable. After investigation it was discovered that, because of faulty maintenance of the line, skin cream was occasionally contaminating the torque head (the part of the line which fitted the cap). This resulted in erratic tightening of the caps. Figure S17.9 The completed control form for GAM’s torque machine showing the mean (X¯ ) and range (R¯ ) charts
532 Part Three Planning and control Figure S17.10 In addition to points falling outside the control limits, other unlikely sequences of points should be investigated Interpreting control charts Plots on a control chart which fall outside control limits are an obvious reason for believing that the process might be out of control, and therefore for investigating the process. This is not the only clue which could be revealed by a control chart, however. Figure S17.10 shows some other patterns which could be interpreted as behaviour sufficiently unusual to warrant investigation. Process control, learning and knowledge In recent years the role of process control and SPC in particular, has changed. Increasingly, it is seen not just as a convenient method of keeping processes in control, but also as an activity which is fundamental to the acquisition of competitive advantage. This is a remarkable shift in the status of SPC. Traditionally it was seen as one of the most operational, immediate and ‘hands-on’ operations management techniques. Yet it is now being connected with an operation’s strategic capabilities. This is how the logic of the argument goes: 1 SPC is based on the idea that process variability indicates whether a process is in control or not.
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sixth edition OperatiOns ManageMent
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Further reading in Operations Manag
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Pearson Education Limited Edinburgh
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Contents Guide to ‘operations in
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Contents ix Chapter 12 Inventory pl
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Guide to ‘operations in practice
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Guide to ‘operations in practice
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Making the most of this book and My
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Making the most of this book and My
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Preface xix Illustrations-based Ope
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To the Student . . . Making the mos
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About the authors Nigel Slack is th
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Publisher’s acknowledgements We a
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Part One INTRODUCTION This part of
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Chapter 1 Operations management 3 O
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Key operations questions Chapter 4
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Chapter 4 Process design Key questi
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88 Part Two Design Figure 4.2 The d
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90 Part Two Design Environmentally
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92 Part Two Design Figure 4.3 Diffe
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94 Part Two Design Professional ser
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96 Part Two Design Figure 4.4 Devia
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98 Part Two Design Figure 4.6 Proce
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100 Part Two Design Figure 4.8 Flow
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102 Part Two Design Given that an i
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104 Part Two Design From Little’s
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106 Part Two Design The relationshi
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108 Part Two Design Summary answers
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110 Part Two Design the grant appli
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Chapter 5 The design of products an
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114 Part Two Design hopeless lack o
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116 Part Two Design Core products a
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118 Part Two Design Figure 5.3 The
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120 Part Two Design Short case Squa
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122 Part Two Design Critical commen
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124 Part Two Design Reducing design
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126 Part Two Design Figure 5.7 A QF
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128 Part Two Design Purpose Basic f
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130 Part Two Design Interactive des
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132 Part Two Design Early conflict
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134 Part Two Design Summary answers
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136 Part Two Design similar. It was
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Chapter 6 Supply network design Key
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140 Part Two Design The supply netw
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142 Part Two Design a particularly
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144 Part Two Design and expanding o
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146 Part Two Design Figure 6.4 Offs
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148 Part Two Design Controversially
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150 Part Two Design Energy costs. O
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152 Part Two Design product and fas
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154 Part Two Design Figure 6.7 Cent
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156 Part Two Design The blue dotted
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158 Part Two Design Table 6.4 The a
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160 Part Two Design Figure 6.11 Rep
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162 Part Two Design Case study Disn
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164 Part Two Design plastic, and ap
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166 Part Two Design of a failing Di
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170 Part Two Design Figure S6.2 Som
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172 Part Two Design Figure S6.3 Tim
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174 Part Two Design Table S6.3 Expo
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176 Part Two Design a comparative s
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178 Part Two Design Operations in p
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180 Part Two Design The basic layou
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182 Part Two Design In functional l
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184 Part Two Design Figure 7.5 The
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186 Part Two Design shown with thre
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188 Part Two Design Table 7.2 The a
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190 Part Two Design Combinatorial c
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192 Part Two Design The general fun
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194 Part Two Design Heuristic proce
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196 Part Two Design Figure 7.16 (a)
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198 Part Two Design the total work
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200 Part Two Design Working from th
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202 Part Two Design ● ● ● Hig
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204 Part Two Design Table 7.4 Stand
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208 Part Two Design What is process
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210 Part Two Design be used where c
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212 Part Two Design Here we will ex
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214 Part Two Design E-business E-co
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216 Part Two Design Table 8.2 Examp
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218 Part Two Design Customer-proces
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220 Part Two Design ‘drive’ it.
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222 Part Two Design Figure 8.6 Diff
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224 Part Two Design Short case SVT
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226 Part Two Design Table 8.5 Prese
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228 Part Two Design Anticipating im
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230 Part Two Design Case study Roch
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232 Part Two Design Problems and ap
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234 Part Two Design Operations in p
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236 Part Two Design Human resource
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238 Part Two Design Table 9.2 Cause
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240 Part Two Design ● Group resou
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242 Part Two Design Job design Job
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244 Part Two Design ● ● ● ●
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246 Part Two Design Figure 9.7 A ty
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248 Part Two Design asked to contri
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250 Part Two Design ● ● ● Eff
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252 Part Two Design Table 9.3 Examp
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254 Part Two Design Qualified worke
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256 Part Two Design Case study Serv
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258 Part Two Design 3 4 5 Step 1 -
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260 Part Two Design them. This mean
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262 Part Two Design Work measuremen
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264 Part Two Design Figure S9.1 Tim
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Chapter 10 The nature of planning a
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Chapter 14 Enterprise resource plan
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Glossary 659 Breakthrough improveme
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Glossary 667 Reliability: when appl
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Glossary 669 Transformation process
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‘blue sky’ research projects 45
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cumulative representation 317-22 cu
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failures (continued) estimates of o
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inventories (continued) de-coupling
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mitigation of ethical practice brea
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precedence diagrams 197-9, 481 prec
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esources 7-8 business continuity 59
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supply chains (continued) meaning 3
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