There are a lot of things to consider when designing online interfaces – not least compliance with data protection, consumer and competition laws.
As part of a joint effort to encourage companies to design their online choice architecture (OCA) in a responsible and compliant manner, the UK’s Information Commissioner’s Office (ICO) and Competition & Markets Authority (CMA) published a joint paper on Harmful Design in Digital Markets and announced a joint collaboration to tackle harmful practices as part of the Digital Regulation Cooperation Forum.
Matthew Hunt, Alice Esuola-Grant and Elisa Lindemann analyse the paper, raising some concerns from the piece and discussing in more detail the Five key harmful OCA practices that featured in the paper.


/Passle/5f3d6e345354880e28b1fb63/MediaLibrary/Images/2025-09-29-13-48-10-128-68da8e1af6347a2c4b96de4e.png)
/Passle/5f3d6e345354880e28b1fb63/MediaLibrary/Images/2026-05-21-15-15-27-017-6a0f218fce5ff08b4a827c38.png)
/Passle/5f3d6e345354880e28b1fb63/MediaLibrary/Images/2024-08-01-13-10-42-472-66ab8952cb2110fd5cb6e568.png)
/Passle/5f3d6e345354880e28b1fb63/SearchServiceImages/2026-06-02-23-10-48-401-6a1f62f83507d41e7a0eb7cd.jpg)