A book for whole R/3 teams including team leaders, customizers and developers to understand the benefits, financial risks and technical backgrounds of IDocs and ALE in interface development. It covers the role of interfaces in an R/3 roll-out and the relationship to common standards like EDIFACT, ANSI X.12 or XML. A large number of recipes deliver templates as a basis of own enhancements. It also works out why many EDI projects are ten times as expensive as they could be.