The Eclipse 3.1 SDK introduced a common API for defining and managing undoable operations. This talk will first discuss the headless operations framework, including how to define undoable operations and how to assign undo contexts to manage a local, shared, or global undo history. It will then discuss techniques for adding undo support to plug-ins, demonstrating workbench classes that simplify the process. The talk will also briefly discuss techniques for migrating from preexisting undo frameworks and the evolving use of the operations framework inside the Eclipse SDK.