A cascaded transaction is a type of distributed transaction, or part of a distributed transaction, in which the coordination between the units of recovery is controlled by RRS. If you have a set of units of recovery, each with a separate work context, which need to be coordinated as a single transaction within a single commit scope, you can group the URs together by performing RRS calls to create a single cascaded transaction. A group of URs related in this way is called a cascaded UR family.