There are many articles online and a few printed books available on the subject of Fact Oriented Modeling. When you've registered you may download an e-Book from the download section containing the original texts on FCO-IM. If you're into self-study, we recommend starting to read from the top. It's recently published and it's really easy to read and learn the basics.

just the facts front

More on the method itself, and exercises (and answers), a collection of columns on the topic, and a real in depth book describing the algorithms under the hood, as designed first in the 90s:

And some of these are also available in Dutch:

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 just the facts