David Hay has written an excellent short presentation that describes the differences between these and places them within the context of the Zachman Framework.
He makes a greate point – how can we expect others to think about language/definitions when those in the data management community often use these terms in such an inconsistent fashion.
The presentation can be seen in the following – Introduction to Data Modeling
David mentioned this presentation in the following – LinkedIn discussion
Posted by Michael Baylon 
