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.
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:
- Fact Oriented Modeling with FCO-IM [2015]
- Exercises and Casus [2004] (e-Book)
- Facts and Things - FOM in practice
- Fully Communication Oriented Information Modeling [2002] (e-Book)
And some of these are also available in Dutch: