Martin Fowler's website contains a wealth of resources on modelling and design topics, including excerpts from his books, additional materials, and articles. His books UML Distilled and Analysis Patterns are essential reading.
If you can read this text, it means you are not experiencing the Plone design at its best.
Plone makes heavy use of CSS, which means it is accessible to any internet browser,
but the design needs a
standards-compliant browser to look like we intended it.
Just so you know ;)