Responsibility Collaborator (CRC) models are an
modeling technique. In other words, because CRC cards are a simple
technique created using simple tools (index cards) they enable you to include
your stakeholders in the modeling process.
In the late 1990s I wrote a white paper regarding this topic, and posted it
as a free download at this site. But then over the years I reworked the
material and reposted it at
AgileModeling.com. I've left this page up for historical purposes,
but as you can see the links provided above are where you need to go.