> For the complete documentation index, see [llms.txt](https://www.mica.wtf/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.mica.wtf/dsa/chapter-iii-due-diligence-obligations-for-a-transparent-and-safe-online-environment-art.-11-48/27.md).

# Art. 27 — Recommender system transparency

DSA Article 27 — Recommender system transparency. Regulation (EU) 2022/2065, Chapter III — Due diligence obligations for a transparent and safe online environment.

1. Providers of online platforms that use recommender systems shall set out in their [terms and conditions](https://headlesslaw.com/definitions/dsa/terms-and-conditions/), in plain and intelligible language, the main parameters used in their recommender systems, as well as any options for the recipients of the service to modify or influence those main parameters.
2. The main parameters referred to in paragraph 1 shall explain why certain information is suggested to the [recipient of the service](https://headlesslaw.com/definitions/dsa/recipient-of-the-service/). They shall include, at least:
   1. the criteria which are most significant in determining the information suggested to the recipient of the service;
   2. the reasons for the relative importance of those parameters.
3. Where several options are available pursuant to paragraph 1 for recommender systems that determine the relative order of information presented to recipients of the service, providers of online platforms shall also make available a functionality that allows the recipient of the service to select and to modify at any time their preferred option. That functionality shall be directly and easily accessible from the specific section of the [online platform](https://headlesslaw.com/definitions/dsa/online-platform/)’s [online interface](https://headlesslaw.com/definitions/dsa/online-interface/) where the information is being prioritised.


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