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The TIG standard directly addresses development of CRFs but does not formally address data collected via other sources. However, the principles and metadata presented can be applied to eSource (also known as "non-CRF") data, such as vendors' electronic data transfer standards and ePRO data structures, as applicable.

ASK ERIN - In practice, there is variety in language used to describe operational concepts used as part of data collection. for consistency language shown below is used throughout this section and should be interpreted as specified.