The Processes and Techniques hierarchy contains terms for actions and methods performed physically on or with materials and objects, and for processes occurring in materials and objects. Included are types of process or technique pertaining to the production and handling of objects or images (e.g., "assembling") or of substances (e.g., "mixing") or relevant to the manipulation and processing of specific materials (e.g., "soldering"). Also included are terms for processes that occur in substances or objects, sometimes initiated intentionally and sometimes occurring spontaneously (e.g., "burning"). Relation to other hierarchies: Terms for organizational, administrative, or intellectual activities conducted to accomplish specific purposes (e.g., "analysis"), including terms relating to the collecting of objects and various other professional activities (e.g., "collections management"), are found in the Functions hierarchy. Terms that designate branches of learning (e.g., "anthropology") are found in the Disciplines hierarchy, while the processes and techniques associated with these fields are contained here. Terms for physical and mental actions not performed to manipulate materials or fabricate objects (e.g., "running," "meditation") are in the Physical and Mental Activities hierarchy. Certain terms that refer to degenerative forces on materials or structures (e.g., "stress") are in the Associated Concepts hierarchy. Descriptors for certain effects caused by processes occurring in materials and objects (e.g., "cracks") appear in the Conditions and Effects hierarchy.