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Designing Graphs to Communicate Risks: Understanding How the Choice of Graphical Format Influences Decision Making

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  • Eric R. Stone
  • Wändi Bruine de Bruin
  • Abigail M. Wilkins
  • Emily M. Boker
  • Jacqueline MacDonald Gibson

Abstract

Previous research suggests that the choice of graphical format for communicating risk information affects both understanding of the risk magnitude and the likelihood of acting to decrease risk. However, the mechanisms through which these effects work are poorly understood. To explore these mechanisms using a real‐world scenario, we examined the relative impact of two graphical displays for depicting the risk of exposure to unexploded ammunition during potential land redevelopment. One display depicted only the foreground information graphically (a bar graph of the number of people harmed), and a second depicted the foreground and background graphically (a stacked bar graph representing both the number harmed and at risk). We presented 296 participants with either the foreground‐only or the foreground and background graphical display and measured a broad set of outcome variables, examining (1) the graphical display effect on each of the outcome measures and (2) the pathways by which any display effects work to influence decision making. We found that the foreground‐only graphical display increased perceived likelihood and experienced fear, which produced greater worry, which in turn increased risk aversion. In addition, a positive evaluation of the communication materials increased support for policies related to land redevelopment, whether those policies were risk taking or risk mitigating. Finally, the foreground‐only graphical display decreased understanding of the risk magnitude, showing that approaches to accomplish one risk communication goal (promoting risk‐averse decisions) may do so at the expense of another goal (increasing understanding).

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  • Eric R. Stone & Wändi Bruine de Bruin & Abigail M. Wilkins & Emily M. Boker & Jacqueline MacDonald Gibson, 2017. "Designing Graphs to Communicate Risks: Understanding How the Choice of Graphical Format Influences Decision Making," Risk Analysis, John Wiley & Sons, vol. 37(4), pages 612-628, April.
    • Handle: RePEc:wly:riskan:v:37:y:2017:i:4:p:612-628
    DOI: 10.1111/risa.12660
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    3. Cameron Brick & Alexandra L. J. Freeman & Steven Wooding & William J. Skylark & Theresa M. Marteau & David J. Spiegelhalter, 2018. "Winners and losers: communicating the potential impacts of policies," Palgrave Communications, Palgrave Macmillan, vol. 4(1), pages 1-13, December.
    4. Paul C. Price & Grace A. Carlock & Sarah Crouse & Mariana Vargas Arciga, 2022. "Effects of icon arrays to communicate risk in a repeated risky decision-making task," Judgment and Decision Making, Society for Judgment and Decision Making, vol. 17(2), pages 378-399, March.
    5. Yasmina Okan & Eric R. Stone & Jonathan Parillo & Wändi Bruine de Bruin & Andrew M. Parker, 2020. "Probability Size Matters: The Effect of Foreground‐Only versus Foreground+Background Graphs on Risk Aversion Diminishes with Larger Probabilities," Risk Analysis, John Wiley & Sons, vol. 40(4), pages 771-788, April.
    6. Lyndal J. Trevena & Carissa Bonner & Yasmina Okan & Ellen Peters & Wolfgang Gaissmaier & Paul K. J. Han & Elissa Ozanne & Danielle Timmermans & Brian J. Zikmund-Fisher, 2021. "Current Challenges When Using Numbers in Patient Decision Aids: Advanced Concepts," Medical Decision Making, , vol. 41(7), pages 834-847, October.
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