Expedition A field visit action in which many sites are visited over a continguous period of time, often involving serveral investigators, and typically having a specific purpose. Expedition actions are typically parents to other related Actions. FieldActivity Parent to site visit actions and other actions ODM2 ActionType Controlled Vocabulary ODM2 Working Group A vocabulary for describing the type of actions performed in making observations. Depending on the action type, the action may or may not produce an observation result.