1. A stage goal is the state that must hold when the stage is complete. 2. A stage task consists of the actions that reach this state. 3. A stage is complete when its goal state holds and each completion condition that `` states holds; finished actions alone do not complete it. 1. When a workflow is active, work only on the stage that the latest workflow record names. 2. A workflow with nested=true, in `` or in a call of workflow_create, starts while the active workflow waits at its stage. When the nested workflow exits, the waiting workflow continues from that stage. 3. A workflow without nested=true replaces each running workflow. Start it only after the active workflow reaches a stage marked as final, unless the user explicitly asks for an urgent change.