Hi Yasmin,
OBI is a community project, and we add new terms as users request them. Here are some notes on that process:
http://obi-ontology.org/page/OBI_term_guidelines
We don't have a fixed schedule for OBI releases. Instead we make a new release when new terms are ready. In practise, we made five releases last year, and just two so far this year.
I'm not sure when the last study design term was added, but if you have terms that you need, please let us know.
Best regards,
James
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