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extended-abstract

Mobilizing Research and Regulatory Action on Dark Patterns and Deceptive Design Practices

Authors:

Johanna T. Gunawan,

René Schäfer,

Nataliia Bielova,

Lorena Sanchez Chamorro,

Thomas Mildner,

Hauke SandhausAuthors Info & Claims

CHI EA '24: Extended Abstracts of the CHI Conference on Human Factors in Computing Systems

Article No.: 482, Pages 1 - 6

https://doi.org/10.1145/3613905.3636310

Published: 11 May 2024 Publication History

Abstract

Deceptive, manipulative, and coercive practices are deeply embedded in our digital experiences, impacting our ability to make informed choices and undermining our agency and autonomy. These design practices—collectively known as “dark patterns” or “deceptive patterns”—are increasingly under legal scrutiny and sanctions, largely due to the efforts of human-computer interaction scholars that have conducted pioneering research relating to dark patterns types, definitions, and harms. In this workshop, we continue building this scholarly community with a focus on organizing for action. Our aims include: (i) building capacity around specific research questions relating to methodologies for detection; (ii) characterization of harms; and (iii) creating effective countermeasures. Through the outcomes of the workshop, we will connect our scholarship to the legal, design, and regulatory communities to inform further legislative and legal action.

References

[1]

Vino Avanesi, Johanna Rockstroh, Thomas Mildner, Nima Zargham, Leon Reicherts, Maximilian A Friehs, Dimosthenis Kontogiorgos, Nina Wenig, and Rainer Malaka. 2023. From C-3PO to HAL: Opening The Discourse About The Dark Side of Multi-Modal Social Agents. In Proceedings of the 5th International Conference on Conversational User Interfaces (Eindhoven, Netherlands) (CUI ’23, Article 62). Association for Computing Machinery, New York, NY, USA, 1–7. https://doi.org/10.1145/3571884.3597441

Digital Library

[2]

Luiz Adolpho Baroni, Alisson Andrey Puska, Luciana Cardoso de Castro Salgado, and Roberto Pereira. 2021. Dark Patterns: Towards a Socio-Technical Approach. In Proceedings of the XX Brazilian Symposium on Human Factors in Computing Systems (Virtual Event, Brazil) (IHC ’21). Association for Computing Machinery, New York, NY, USA, Article 15, 7 pages. https://doi.org/10.1145/3472301.3484336

Digital Library

[3]

Nataliia Bielova, Laura Litvine, Anysia Nguyen, Mariam Chammat, Vincent Toubiana, and Estelle Harry. 2024. The Effect of Design Patterns on (Present and Future) Cookie Consent Decisions. In USENIX Security Symposium. USENIX Association. Accepted for publication.

[4]

Nataliia Bielova, Cristiana Santos, and Colin M. Gray. 2024. Two worlds apart! Closing the gap between regulating EU consent and user studies. Harvard Journal of Law and Technology (JOLT) 37 (2024).

[5]

Kerstin Bongard-Blanchy, Arianna Rossi, Salvador Rivas, Sophie Doublet, Vincent Koenig, and Gabriele Lenzini. 2021. ”I am Definitely Manipulated, Even When I am Aware of it. It’s Ridiculous!” - Dark Patterns from the End-User Perspective. In Designing Interactive Systems Conference 2021 (Virtual Event, USA) (DIS ’21, Vol. 1). Association for Computing Machinery, New York, NY, USA, 763–776. https://doi.org/10.1145/3461778.3462086

Digital Library

[6]

Ida Borberg, Rene Hougaard, Willard Rafnsson, and Oksana Kulyk. 2022. “So I Sold My Soul”: Effects of Dark Patterns in Cookie Notices on End-User Behavior and Perceptions. In Usable Security and Privacy (USEC) Symposium 2022. NDSS, San Diego, CA, USA, 11 pages. https://doi.org/10.14722/usec.2022.23026

[7]

Christoph Bösch, Benjamin Erb, Frank Kargl, Henning Kopp, and Stefan Pfattheicher. 2016. Tales from the Dark Side: Privacy Dark Strategies and Privacy Dark Patterns. Proceedings on Privacy Enhancing Technologies 2016, 4 (2016), 237–254. https://doi.org/10.1515/popets-2016-0038

[8]

Beni Chugh and Pranjal Jain. 2021. Unpacking Dark Patterns: Understanding Dark Patterns and Their Implications for Consumer Protection in the Digital Economy. RGNUL Student Research Review Journal 7 (2021), 23.

[9]

Linda Di Geronimo, Larissa Braz, Enrico Fregnan, Fabio Palomba, and Alberto Bacchelli. 2020. UI Dark Patterns and Where to Find Them: A Study on Mobile Applications and User Perception. In Proceedings of the 2020 CHI Conference on Human Factors in Computing Systems. ACM, Honolulu HI USA, 1–14. https://doi.org/10.1145/3313831.3376600

Digital Library

[10]

Chloe Eghtebas, Gudrun Klinker, Susanne Boll, and Marion Koelle. 2023. Co-Speculating on Dark Scenarios and Unintended Consequences of a Ubiquitous(ly) Augmented Reality. In Proceedings of the 2023 ACM Designing Interactive Systems Conference. ACM, Pittsburgh PA USA, 2392–2407. https://doi.org/10.1145/3563657.3596073

Digital Library

[11]

European Data Protection Board. 2022. Guidelines 3/2022 on Dark patterns in Social Media Platform Interfaces: How to Recognise and Avoid Them. European Data Protection Board, Brussels, Belgium. https://edpb.europa.eu/our-work-tools/our-documents/guidelines/guidelines-032022-deceptive-design-patterns-social-media_en

[12]

Dan Fitton and Janet C. Read. 2019. Creating a Framework to Support the Critical Consideration of Dark Design Aspects in Free-to-Play Apps. In Proceedings of the 18th ACM International Conference on Interaction Design and Children. ACM, Boise ID USA, 407–418. https://doi.org/10.1145/3311927.3323136

Digital Library

[13]

Colin M Gray, Jingle Chen, Shruthi Sai Chivukula, and Liyang Qu. 2021. End User Accounts of Dark Patterns as Felt Manipulation. Proceedings of the ACM on Human-Computer Interaction 5, CSCW2 (2021), Article 372. https://doi.org/10.1145/3479516

Digital Library

[14]

Colin M Gray and Shruthi Sai Chivukula. 2019. Ethical Mediation in UX Practice. In Proceedings of the 2019 CHI Conference on Human Factors in Computing Systems (Glasgow, Scotland Uk) (CHI ’19, Paper 178). Association for Computing Machinery, New York, NY, USA, 1–11. https://doi.org/10.1145/3290605.3300408

Digital Library

[15]

Colin M Gray, Shruthi Sai Chivukula, and Ahreum Lee. 2020. What Kind of Work Do “Asshole Designers” Create? Describing Properties of Ethical Concern on Reddit. In Proceedings of the 2020 ACM Designing Interactive Systems Conference (Eindhoven, Netherlands) (DIS ’20). Association for Computing Machinery, New York, NY, USA, 61–73. https://doi.org/10.1145/3357236.3395486

Digital Library

[16]

Colin M Gray, Yubo Kou, Bryan Battles, Joseph Hoggatt, and Austin L Toombs. 2018. The Dark (Patterns) Side of UX Design. In Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems (Montreal QC, Canada) (CHI ’18). dl.acm.org, New York, NY, USA, 534:1–534:14. https://doi.org/10.1145/3173574.3174108

Digital Library

[17]

Colin M Gray, Craig M Macdonald, Carine Lallemand, Alannah Oleson, Anna R L Carter, Olivier St-Cyr, and Caroline Pitt. 2023. EduCHI 2023: 5th Annual Symposium on HCI Education. In Extended Abstracts of the 2023 CHI Conference on Human Factors in Computing Systems (Hamburg, Germany) (CHI EA ’23, Article 347). Association for Computing Machinery, New York, NY, USA, 1–5. https://doi.org/10.1145/3544549.3573790

Digital Library

[18]

Colin M Gray, Lorena Sanchez Chamorro, Ike Obi, and Ja-Nae Duane. 2023. Mapping the Landscape of Dark Patterns Scholarship: A Systematic Literature Review. In Companion Publication of the 2023 ACM Designing Interactive Systems Conference (Pittsburgh, PA, USA) (DIS ’23 Companion). Association for Computing Machinery, New York, NY, USA, 188–193. https://doi.org/10.1145/3563703.3596635

Digital Library

[19]

Colin M Gray, Cristiana Santos, and Nataliia Bielova. 2023. Towards a Preliminary Ontology of Dark Patterns Knowledge. In Extended Abstracts of the 2023 CHI Conference on Human Factors in Computing Systems (Hamburg, Germany) (CHI EA ’23). Association for Computing Machinery, New York, NY, USA, Article 286, 9 pages. https://doi.org/10.1145/3544549.3585676

Digital Library

[20]

Colin M Gray, Cristiana Santos, Nataliia Bielova, and Thomas Mildner. 2023. An Ontology of Dark Patterns Knowledge: Foundations, Definitions, and a Pathway for Shared Knowledge-Building. arxiv:2309.09640 [cs.HC] http://arxiv.org/abs/2309.09640

[21]

Colin M Gray, Cristiana Santos, Nataliia Bielova, Michael Toth, and Damian Clifford. 2021. Dark Patterns and the Legal Requirements of Consent Banners: An Interaction Criticism Perspective. In Proceedings of the 2021 CHI Conference on Human Factors in Computing Systems(CHI’21). ACM Press, New York, NY, USA, Article 172, 18 pages. https://doi.org/10.1145/3411764.3445779

Digital Library

[22]

Colin M Gray, Cristiana Santos, Nicole Tong, Thomas Mildner, Arianna Rossi, Johanna Gunawan, and Caroline Sinders. 2023. Dark Patterns and the Emerging Threats of Deceptive Design Practices. In Extended Abstracts of the 2023 CHI Conference on Human Factors in Computing Systems (CHI EA ’23). Association for Computing Machinery, New York, NY, USA, 4 pages. https://doi.org/10.1145/3544549.3583173

Digital Library

[23]

Johanna Gunawan, David Choffnes, Woodrow Hartzog, and Christo Wilson. 2021. A Comparative Study of Dark Patterns Across Mobile and Web Modalities. In Proceedings of the ACM on Human-Computer Interaction (Virtual Event, Canada) (CSCW ’21, Vol. 5). Association for Computing Machinery, New York, NY, USA, Article 377, 29 pages. Issue CSCW2. https://doi.org/10.1145/3479521

Digital Library

[24]

Johanna Gunawan, David Choffnes, Woodrow Hartzog, and Christo Wilson. 2021. The COVID-19 Pandemic and the Technology Trust Gap. Seton Hall Law Review 51, 3 (Sept. 2021), 29 pages. Issue 5. https://scholarship.shu.edu/shlr/vol51/iss5/3

[25]

Johanna Gunawan, Cristiana Santos, and Irene Kamara. 2022. Redress for Dark Patterns Privacy Harms? A Case Study on Consent Interactions. In Proceedings of the 2022 Symposium on Computer Science and Law (CSLAW ’22). Association for Computing Machinery, New York, NY, USA, 181–194. https://doi.org/10.1145/3511265.3550448

Digital Library

[26]

Shun Hidaka, Sota Kobuki, Mizuki Watanabe, and Katie Seaborn. 2023. Linguistic Dead-Ends and Alphabet Soup: Finding Dark Patterns in Japanese Apps. In Proceedings of the 2023 CHI Conference on Human Factors in Computing Systems (Hamburg, Germany) (CHI ’23). Association for Computing Machinery, New York, NY, USA, Article 3, 13 pages. https://doi.org/10.1145/3544548.3580942

Digital Library

[27]

Woo Gon Kim, Souji Gopalakrishna Pillai, Kavitha Haldorai, and Wasim Ahmad. 2021. Dark patterns used by online travel agency websites. Annals of Tourism Research 88 (2021), 103055. https://doi.org/10.1016/j.annals.2020.103055

[28]

Monica Kowalcyzk*, Johanna Gunawan*, Daniel Dubois, David Choffnes, Woodrow Hartzog, and Christo Wilson. 2023. Understanding Dark Patterns in Home IoT Devices. In Proceedings of the 2023 CHI Conference on Human Factors in Computing Systems (Hamburg, Germany) (CHI ’23). Association for Computing Machinery, New York, NY, USA, 27 pages. https://doi.org/10.1145/3544548.3581432

Digital Library

[29]

Kai Lukoff, Alexis Hiniker, Colin M Gray, Arunesh Mathur, and Shruthi Sai Chivukula. 2021. What can CHI do about dark patterns?. In Extended Abstracts of the 2021 CHI Conference on Human Factors in Computing Systems (Yokohama Japan). ACM, New York, NY, USA, 6 pages. https://doi.org/10.1145/3411763.3441360

Digital Library

[30]

Francisco Lupiáñez-Villanueva, Alba Boluda, Francesco Bogliacino, Giovanni Liva, Lucie Lechardoy, and Teresa Rodríguez de las Heras Ballell. 2022. Behavioural study on unfair commercial practices in the digital environment : dark patterns and manipulative personalisation : final report. Publications Office of the European Union, Brussels, Belgium. https://doi.org/10.2838/859030

[31]

Arunesh Mathur, Gunes Acar, Michael J. Friedman, Elena Lucherini, Jonathan Mayer, Marshini Chetty, and Arvind Narayanan. 2019. Dark Patterns at Scale: Findings from a Crawl of 11K Shopping Websites. Proceedings of the ACM on Human-Computer Interaction 3, CSCW (Nov. 2019), 1–32. https://doi.org/10.1145/3359183 arXiv:1907.07032.

Digital Library

[32]

Arunesh Mathur, Gunes Acar, Michael J Friedman, Elena Lucherini, Jonathan Mayer, Marshini Chetty, and Arvind Narayanan. 2019. Dark Patterns at Scale: Findings from a Crawl of 11K Shopping Websites. Proceedings of the ACM on Human-Computer Interaction 3, CSCW (Nov. 2019), Article No. 81. https://doi.org/10.1145/3359183

Digital Library

[33]

Arunesh Mathur, Mihir Kshirsagar, and Jonathan Mayer. 2021. What Makes a Dark Pattern... Dark? Design Attributes, Normative Considerations, and Measurement Methods. In Proceedings of the 2021 CHI Conference on Human Factors in Computing Systems. Association for Computing Machinery, New York, NY, USA, 1–18. https://doi.org/10.1145/3411764.3445610

Digital Library

[34]

Célestin Matte, Nataliia Bielova, and Cristiana Santos. 2020. Do Cookie Banners Respect my Choice? Measuring Legal Compliance of Banners from IAB Europe’s Transparency and Consent Framework. In IEEE Symposium on Security and Privacy (IEEE S&P). IEEE. https://hal.inria.fr/hal-03117294.

[35]

Thomas Mildner, Philip Doyle, Gian-Luca Savino, and Rainer Malaka. 2022. Rules Of Engagement: Levelling Up To Combat Unethical CUI Design. In 4th Conference on Conversational User Interfaces. ACM, Glasgow United Kingdom, 1–5. https://doi.org/10.1145/3543829.3544528

Digital Library

[36]

Thomas Mildner, Merle Freye, Gian-Luca Savino, Philip R Doyle, Benjamin R Cowan, and Rainer Malaka. 2023. Defending Against the Dark Arts: Recognising Dark Patterns in Social Media. In Proceedings of the 2023 ACM Designing Interactive Systems Conference (Pittsburgh, PA, USA) (DIS ’23). Association for Computing Machinery, New York, NY, USA, 2362–2374. https://doi.org/10.1145/3563657.3595964

Digital Library

[37]

Thomas Mildner and Gian-Luca Savino. 2021. Ethical User Interfaces: Exploring the Effects of Dark Patterns on Facebook. In Extended Abstracts of the 2021 CHI Conference on Human Factors in Computing Systems. ACM, Yokohama Japan, 1–7. https://doi.org/10.1145/3411763.3451659

Digital Library

[38]

Thomas Mildner, Gian-Luca Savino, Philip R Doyle, Benjamin R Cowan, and Rainer Malaka. 2023. About Engaging and Governing Strategies: A Thematic Analysis of Dark Patterns in Social Networking Services. In Proceedings of the 2023 CHI Conference on Human Factors in Computing Systems (Hamburg, Germany) (CHI ’23, Article 192). Association for Computing Machinery, New York, NY, USA, 1–15. https://doi.org/10.1145/3544548.3580695

Digital Library

[39]

Carol Moser, Sarita Y. Schoenebeck, and Paul Resnick. 2019. Impulse Buying: Design Practices and Consumer Needs. In Proceedings of the 2019 CHI Conference on Human Factors in Computing Systems. ACM, Glasgow Scotland Uk, 1–15. https://doi.org/10.1145/3290605.3300472

Digital Library

[40]

OECD. 2022. Dark commercial patterns. Number 336 in OECD Digital Economy Papers. OECD Publishing, Paris, France. 96 pages. https://doi.org/10.1787/44f5e846-en

[41]

OECD. 2023. Consumer Vulnerability in the Digital Age. Number 355 in OECD Digital Economy Papers. OECD Publishing, Paris, France. 80 pages. https://doi.org/10.1787/4d013cc5-en

[42]

Kentrell Owens, Johanna Gunawan, Pardis Emami-Naeini, David Choffnes, Tadayoshi Kohno, and Franziska Roesner. 2022. Exploring Deceptive Design Patterns in Voice Interfaces. In Proceedings of the 2022 European Symposium on Usable Security (Karlsruhe, Germany) (EuroUSEC ’22). Association for Computing Machinery, New York, NY, USA, 64–78. https://doi.org/10.1145/3549015.3554213

Digital Library

[43]

Hauke Sandhaus. 2023. Bright Patterns. https://www.brightpatterns.org Retrieved on 2023-09-27.

[44]

Hauke Sandhaus. 2023. Promoting Bright Patterns. CHI ’23 Workshop: Designing Technology and Policy Simultaneously. arxiv:2304.01157 [cs.HC] http://arxiv.org/abs/2304.01157

[45]

Cristiana Santos, Midas Nouwens, Michael Toth, Nataliia Bielova, and Vincent Roca. 2021. Consent Management Platforms under the GDPR: processors and/or controllers?. In Annual Privacy Forum (APF’21). https://hal.inria.fr/hal-03169436. .

[46]

René Schäfer, Paul Miles Preuschoff, and Jan Borchers. 2023. Investigating Visual Countermeasures Against Dark Patterns in User Interfaces. In Proceedings of Mensch Und Computer 2023 (Rapperswil, Switzerland) (MuC ’23). Association for Computing Machinery, New York, NY, USA, 161–172. https://doi.org/10.1145/3603555.3603563

Digital Library

[47]

Brennan Schaffner, Neha A. Lingareddy, and Marshini Chetty. 2022. Understanding Account Deletion and Relevant Dark Patterns on Social Media. Proceedings of the ACM on Human-Computer Interaction 6, CSCW2 (Nov. 2022), 1–43. https://doi.org/10.1145/3555142

Digital Library

[48]

Michael Toth, Nataliia Bielova, and Vincent Roca. 2022. On dark patterns and manipulation of website publishers by CMPs. In Proceedings on Privacy Enhancing Technologies Symposium, Vol. 2022. 478–497. https://doi.org/10.56553/popets-2022-0082

[49]

Xian Wang, Lik-Hang Lee, Carlos Bermejo Fernandez, and Pan Hui. 2023. The Dark Side of Augmented Reality: Exploring Manipulative Designs in AR. International Journal of Human–Computer Interaction 0, 0 (March 2023), 1–16. https://doi.org/10.1080/10447318.2023.2188799

[50]

José P Zagal, Staffan Björk, and Chris Lewis. 2013. Dark Patterns in the Design of Games. In Proceedings of the 8th International Conference on the Foundations of Digital Games (FDG 2013). Society for the Advancement of the Science of Digital Games, Santa Cruz, CA, USA, 8. https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-24252

Cited By

Zargham NDubiel MDesai SMildner TBelz H(2024)Designing AI Personalities: Enhancing Human-Agent Interaction Through Thoughtful Persona DesignProceedings of the International Conference on Mobile and Ubiquitous Multimedia10.1145/3701571.3701608(490-494)Online publication date: 1-Dec-2024
https://dl.acm.org/doi/10.1145/3701571.3701608
Gray CSantos CBielova NMildner T(2024)An Ontology of Dark Patterns Knowledge: Foundations, Definitions, and a Pathway for Shared Knowledge-BuildingProceedings of the 2024 CHI Conference on Human Factors in Computing Systems10.1145/3613904.3642436(1-22)Online publication date: 11-May-2024
https://dl.acm.org/doi/10.1145/3613904.3642436

Index Terms

Mobilizing Research and Regulatory Action on Dark Patterns and Deceptive Design Practices
1. Applied computing
2. Social and professional topics

Index terms have been assigned to the content through auto-classification.

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cover image ACM Conferences

CHI EA '24: Extended Abstracts of the CHI Conference on Human Factors in Computing Systems

May 2024

4761 pages

ISBN:9798400703317

DOI:10.1145/3613905

Editors:
Florian Floyd Mueller
Monash University
,
Penny Kyburz
The Australian National University
,
Julie R. Williamson
University of Glasgow
,
Corina Sas
Lancaster University

Copyright © 2024 Owner/Author.

Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for third-party components of this work must be honored. For all other uses, contact the Owner/Author.

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Published: 11 May 2024

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Klaus Tschira Stiftung gGmbH (the non-profit Klaus Tschira Foundation)
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CHI '24: CHI Conference on Human Factors in Computing Systems

May 11 - 16, 2024

HI, Honolulu, USA

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Overall Acceptance Rate 6,164 of 23,696 submissions, 26%

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Cited By

Zargham NDubiel MDesai SMildner TBelz H(2024)Designing AI Personalities: Enhancing Human-Agent Interaction Through Thoughtful Persona DesignProceedings of the International Conference on Mobile and Ubiquitous Multimedia10.1145/3701571.3701608(490-494)Online publication date: 1-Dec-2024
https://dl.acm.org/doi/10.1145/3701571.3701608
Gray CSantos CBielova NMildner T(2024)An Ontology of Dark Patterns Knowledge: Foundations, Definitions, and a Pathway for Shared Knowledge-BuildingProceedings of the 2024 CHI Conference on Human Factors in Computing Systems10.1145/3613904.3642436(1-22)Online publication date: 11-May-2024
https://dl.acm.org/doi/10.1145/3613904.3642436

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