Page created for 1/1/15 site lunch and transferred to new site 11/8/19, last new addition 31/7/15. Authorship of each post should be clear, Attribution 4.0 International (CC BY 4.0) applies to all posts.

Let me know if you have questions about the CORE system or instruments. I try to answer Emails as fast as I can and now I’m launching a revamped and more manageable site I will try to convert questions that come up more than a couple of times to entries here. Please read the first FAQ before any others.


  1. Responsibilities and legalities. Please read this short note before any other FAQ!
  2. Are the instruments really free to use?
  3. How do I interpret LD-CORE scores?
  4. Gender classification in CORE instruments.