There are 3 basic elements in a entity relationship diagram. If you visit http://www.umsl.edu/~sauterv/analysis/er/er_intro.html you can read about the basic elements. On this website it shows a how to draw an entity relationship diagram free. You could also visit http://en.wikipedia.org/wiki/Entity-relationship_diagram. This site gives you a definition of what entity relationship diagrams are
. used for. It also gives a diagram from which you can use to build your own entity relationship diagram.
