Hi, I looked at the examples of decision tables in Excel and from what I understand the only type of rules that are supported in Excel are of the form: (Object1.var1 > $param) AND (Object2.var2 == $param) AND (...) ... So that basically all columns are concatenated via AND. Is it possible to do something more complex, including grouping and ORs, like: ((Object1.var1 > $param) AND (Object2.var2 == $param)) OR (Object3.var3 < $param) ?? // and other like that , with indefinite level of grouping/ concatenation via AND and OR) The activation-group concept won't help here because it is an exclusive OR of rows, not columns, as I understand. thanks, Marina