The Evidence & Conclusion Ontology is developed on GitHub. To submit a request for a new term, continue below. If you are interested in getting involved and want to contribute to the project, we encourage you to contact us.

Submitting New Terms

We strive to produce concise, yet descriptive, ontology term labels and definitions. Please review the following points before submitting your request. You can also click below for more information on requesting new terms.

  • Succinct term name (also called a “label”)
  • What generated the evidence should be the focus of the term…
  • Aristotelian definition, in the form of "B is an A that C's"
  • Definitions should be succinct and fit into one sentence
  • Suggest a parent term, either existing or new.
  • Provide a reference for the definition, preferably a PubMed identifier for a non-pay walled publication
  • Additional information or suggestions are welcomed!
    • Please help us refine ECO: if you encounter a problem with an existing term label, definition, or position within the ontology, create a tracker issue.


    Direct download of the ontology with a web browser:

    You may download ECO ontology files using a web browser. For the most recent release, navigate to the GitHub repository and click on eco.obo or eco.owl. The full file will load into your browser. Next, click on “Raw” on the upper right side of the page and save according to your preferred method.

    Raw files are here:

    Command-line access for downloading the ontology

    For those familiar with the command line, please download ECO from our GitHub repository using git:

    git clone

    Complete instructions are here:


    Command-line, GUI & IDE access for developers

    If you are a developer already contributing to the ECO project, see complete instructions for checking out and editing here:

    If you are not a developer but would like to contribute, we’d love to hear from you! Please either submit a tracker issue request or contact the ECO team.