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Richard Wilson and Edmund A.C. Crouch
Published by Harvard
Center for Risk Analysis
Distributed by:
Harvard
University
Press
79 Garden Street
Cambridge,
Massachusetts 02138
Telephone: 617-495-2600
FAX: 617 496 2550
E mail: hup@harvard.edu
http://www.hup.harvard.edu/catalog/WILRIS.html
***************************************
FOR THOSE WHO WANT A
LESS TECHNICAL BOOK
Ropeik D and
Gray G
Harvard Center for
Risk Analysis
Table of Contents
of
Risk Benefit Analysis
Preface
xi
1. Introduction: Perspective on Risk 1
Perception is
Crucial
3
Definition of
Risk
7
Risk Changes as Events
Unfold
9
Measures of Risk 10
Different Measures Can Lead to Different
Decisions 13
Absolute or Incremental
Risk
16
Defining the System
Boundary
17
Layout of the
Book
20
2. Methods of Risk
Calculation
and Estimation
25
Evaluation of Historical
Risks
27
Historical Risk Plus a
Model
33
New Risks: (1)Factorization of an Engineering System
with an Event
Tree
38
New Risks: (2) of Epidemiology and Its Ambiguities
45
Risks of Doses Less than Background: The Linear
Default
47
Beneficial Effects and
Hormesis
51
New Risks: (3) The Use of Animal Data to Estimate Risks
to
Humans
53
Probability of
Causation
60
Elicitation of Expert
Opinion
62
Exposure and Dose
Estimation
63
The Risk of a System the Impact Pathway
Approach 68
Risk of the
Impossible
71
Large and Immeasurable
Risks
72
The Chimera of Zero Risk Predictable but Irrelevant
73
3. Uncertainty and
Variability
75
Risk Implies
Uncertainty
75
Different Types of
Uncertainty
77
As Risk Changes with Time, So Does
Uncertainty 78
Stochastic
Uncertainties
78
Variability vs.
Uncertainty
79
Uncertainty vs.
Error
82
Uncertainty in Cancer Risk
Assessment
84
Monte Carlo
Models
85
Model
Uncertainty
86
Uncertainty in Expert
Elicitation
88
Overconfidence in Uncertainty
Estimates
88
4. Perception of Risks
91
Tverskys Analyses
92
Other Attributes and
Dimensions
94
Managers and Decision Makers Consider Public Perception 99
Comparing Risks (Risk-Risk
Comparisons)
105
Comparing Risks for the Same Benefit (Cost
Effectiveness)
112
Expression of
Risks
113
Public
Misconceptions
115
Common Public
Misconceptions
115
Recipe for
Communication
120
5. Formal Comparison of Risk
and
Benefit
123
Distributional
Inequity
125
Issues in Deriving the
Constants
126
Discounting
131
Approximations and Simplified
Schemes
132
6. Risk Management: Managing
and
Reducing Risks
135
We Calculate Risks in Order to Reduce
Them
136
Schemes for Analyzing Risk Management
Options 136
Criteria for Risk
Management
140
The Ban or
Taboo
143
Best Available Control
Technology
144
Risk-Cost-Benefit
Analysis
146
Regulation on Upper Limit of
Risk
146
Risk versus Certainty of
Information
148
The De Minimis Risk
148
Regulations of the U.S.
EPA
149
Probability of
Causation
150
Management by Avoiding
Precursors
154
Risk vs.Certainty of
Information
155
Asbestos and
Dioxin
157
Reducing Risk by Technological
Improvement
159
Radiation
Protection
160
Economic
Incentives
161
The Multiple Uses of a Risk
Assessment
162
Use of Comparisons to Guide a
Manager
162
Safety Culture and the Importance of
Incentives 163
Congress as the Filter for Societal
Values
164
The Dual Role of the
Courts
165
7. Lists of Risks
169
Some Examples of Risk
Calculations
170
The Risk (of Death) in
Living
170
Life
Expectancy
172
A Selection of Risks: Historically
Calculated 173
Time (or Action)to Reach One in a Million
Risk 183
Loss of Life Expectancy
(LOLE)
185
A Partial List of
Catastrophes
188
Amounts Paid to Avert
Deaths
190
Variation and
Uncertainties
197
Detailed Discussions of Some
Risks
199
8. Bibliography
239
Books
239
Journals
251
Websites
252
Specific
References
255
Appendix 1: Some Famous Quotations 277
Appendix 2: Application of
EPAs
Hazardous Waste
Identification
Rule
283
1.Variability
284
2.Uncertainty
285
3.Legislative Mandate and its
Interpretation
286
4.Precise
Definitions
289
Appendix 3: Procedure Used for Age Adjustment by NCHS 299
Appendix 4: Are Mushrooms
Safe to
Eat, or Should They
Be Considered Toxic Waste?
301
The
Problem
301
Materials and
Methods
301
Results
302
Implications
303
Modifying
Comments
305
Appendix 5:Evaluating the
Lung-Cancer Risks Due to
Smoking, Exposure to Asbestos, and
Their Combination 307
Smoking
308
Asbestos
316
Assigning Causation of Lung Cancer to Smoking and
Asbestos the Logic of the Approach
321
Interaction between Smoking and
Cigarettes
324
COMMENTS BY
DISTINGUISHED
PERSONS
Dr.
Arthur Upton
A distinguished physician, was the Director of the National Cancer
Institute in the late 1970s.
*****************************************************************************************
This is by far the best book yet
available on risk benefit analysis.
Based on long study and personal field experience (e.g. Chernobyl) the
authors have covered
the entire spectrum of risk-benefit analysis in authoritative fashion.
They have assembled a remarkable array of pertinent data and used them
to illustrate their
analyses and these data are themselves fascinating. They have
successfully bridged the huge gap between often wildly subjective
public perceptions of risk
and the now possible objective analyses of these risks. This book is
not only required reading for anyone involved with risk assessment and
management but
also, and more important, it can be highly recommended to the
interested public.
Dr.
Allan Bromley
Sterling Professor of the Sciences and
Dean of Engineering, Yale University
and
The Assistant for Science and Technology
To President George Bush 1989-1993
******************************************************************************************
Managing risk in a free society is an extremely difficult
task.
No one knows more about how to analyze risk and balance it against the
benefits to society than
Dick Wilson and Edmund Crouch . Anyone interested in this subject
and who wants to know more about it, should read this book. You
will come away from
that effort with a more balanced view of risk and more toleration for
processes whereby we analyze risk and balance it against the good
things we all want.
William
D. Ruckelshaus
William Doyle Ruckelshaus was the first EPA Agency
Administrator, 1970 to 1973 and again from 1983-1985. He was
briefly Acting FBI Director, and
Deputy Attorney General. He is now a principal in Madrona
Investment Group, in Seattle.
since July 2nd, 2003