Quantifying and managing disruption claims

Contents
Acknowledgements viii
Preface ix
1 Introduction
1.1 Introduction 1
1.2 delay and disruption 1
1.3 The problem 5
1.4 The proposed solution for quantifying
disruption claims 8
1.5 Chapter layout 11
2 Construction contract disruption claims
Summary 13
2.1 Claims, conflict and disputes in the construction
industry 15
2.2 Management of claims and conflict 18
2.3 The construction process control 22
2.4 Practical conclusions 26
3 Cost and time modelling
Summary 27
3.1 Introduction 27
3.2 The original purpose of the BoQ 28
3.3 Positive aspects of the BoQ 30
3.4 Negative aspects of the BoQ 30
3.5 Previous attempts to rationalise the BoQ 38
3.6 Time in construction contracts 46
3.7 Practical conclusions 48
4 Demonstration Stage 1: The development of cost
and time models built around labour/resource
productivity
Summary 51
4.1 Time and cost 52
4.2 Proposed characteristic productivity
modelling system 54
4.3 Development of “characteristic productivity models” 61
4.4 Practical application of work packaging 70
4.5 Developing characteristic productivity models
for use in site labour productivity measurement 71
4.6 Practical concerns 89
4.7 Practical conclusions 91
5 Demonstration Stage 2: The development of a
disruption and site labour productivity
measurement scheme
Summary 93
5.1 Productivity measurement 93
5.2 Labour productivity measurement on site 96
5.3 Proposed method of productivity measurement 99
5.4 Site characteristics 103
5.5 Practical conclusions 106
6 Demonstration Stage 3: Measuring disruption
and site labour productivity in practice
Summary 107
6.1 Introduction: The next steps 108
6.2 Presentation of the site labour productivity
measurements 110
6.3 Statistical characteristics 123
6.4 Analysis of sample sizes and margins of error 128
6.5 Variability of site labour productivity measurements 132
6.6 Practical aspects of quantifying disruption 136
6.7 Practical conclusions 142
7 Demonstration Stage 4: Quantifying the effect
of disruption on site labour productivity
Summary 143
7.1 Quantifying the effects of disruption 144
7.2 How to carry out statistical analysis 147
7.3 The actual effect of disruption on site productivity 161
7.4 Practical conclusions 165
8 Demonstration Stage 5: Managing disruption
and improving site labour productivity
Summary 167
8.1 Improving construction performance 168
8.2 Site labour productivity improvement 170
8.3 Monitoring disruption and site labour productivity 175
8.4 Feedback – calculation of actual productivity 181
8.5 Practical conclusions 186
9 Demonstration Stage 6: Practical use of productivity
measurements in quantifying disruption
Summary 189
9.1 Introduction 190
9.2 The role of productivity measurements in the
quantification of the effects of disruption 192
9.3 The role of operational charges 198
10 Quantifying disruption: The legal issues
Summary 203
10.1 Status of the proposed solution 204
10.2 Legally acceptable methods of quantifying disruption 205
10.3 Global claims 208
10.4 No loss/expense awarded if no loss in actual
productivity 214
100.5 Apportioning the causes of disruption 216
10.6 Notice requirements for contractors 221
Appendix A – Demonstration Project 2: Work packages
and operational charges 233
Appendix B – Demonstration Project 1: Work packages
and operation charges 254
Appendix C – Typical BoQ sections 280
Appendix D – Daily ganger return forms 286
Appendix E – Demonstration Stage 3: Normality plots 290
Appendix F – Statistical methods 296
Appendix G – Over-determined least-squares solution 301
Index 303