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/SearchServiceImages/2025-12-10-14-03-23-339-69397dab6a0d5791a6f9d0bc.jpg)
/Passle/5f3d6e345354880e28b1fb63/MediaLibrary/Images/2025-07-10-13-52-35-189-686fc5a39f23a993118ba1a0.png)
/Passle/5f3d6e345354880e28b1fb63/MediaLibrary/Images/2025-12-09-16-34-55-174-69384faf1b6076d9d899c3a5.png)