"The procedure, technique, or mode of inquiry used to attain the data."
"Specifies the event happening over the data life cycle that is considered significant enough to document."
"Describes the physical format(s) of the data documented in the logical product(s) of a study unit."
"Identifies the type of data, which has a bearing on the acceptable data values, the operations that can be performed with the data, and the ways in which the data are stored. The present list is based on the W3C data types, and includes the terms relevant for documenting research data."
"Identifies the type of aggregation used to combine related categories, usually within a common branch of a hierarchy, to provide information at a broader level than the level at which detailed observations are taken."