Electronic data interchange (or EDI) has been in existence for some time and detailed trading partner agreements can avoid many of the costs and concerns in doing business on-line via EDI. Basically, EDI is the same as an e-mail with the addition of a command structure set for automatic processing. E-Sign, discussed above, validates EDI in that electronic transactions are given the same validity as paper documents. A model EDI agreement is available from the American Bar Association. You can order a copy of The Commercial Use of Electronic Data Interchange: AReport and Model Trading Partner Agreement from the American Bar Association at 312/988-5522.