摘要: Ordered Decision Diagrams (ODDs) as a means for the representation of Boolean functions are used in many applications CAD. Depending on decomposition type, various classes ODDs have been defined, among them being Binary (OBDDs), Functional (OFDDs) and Kronecker (OKFDDs). Based formalization concept type we first investigate all possible types prove that already OKFDDs, which result from application only three types, most general class ODDs. We then show (more) theoretical point view generality OKFDDs is really needed. several exponential gaps between specific ODDs, e.g. one side OBDDs, OFDDs other side. Combining these results it follows restriction OKFDD to subclasses, such OBDDs well, families lose their efficient representation.