This article is excellent at describing the basics of ER modelling and it only takes 10 minutes to read! 

I'm very happy to see it because it accurately represents my view of ER modelling.  Recently I have witnessed what other developers have called ER diagrams but in my view are simply just table diagrams.  Obviously this had led to much confusion and "heated" discussions!

True there are other methods of modelling data - but can they really be called an ER diagram?  Shouldn't the term ER be specific to the diagram notation described in this article?