The level of quality control (QC) for metadata will vary based on the nature of the project, the project’s end goal, and the project’s metadata specifications.Metadata is created at multiple points throughout the digital project life cycle. For example, rights metadata is captured during the planning phase in the Risk Assessment Matrix,and later recorded in the
project’s metadata worksheet, whereas descriptive metadata is captured during the implementation
phase directly in the metadata worksheet. The workflow for creating metadata varies from project-
to-project. When scanning is done in-house, metadata is recorded simultaneous to scanning. Other times, like when scanning is outsourced to a vendor, it is recorded after scanning has been completed.
https://www.library.ucla.edu/sites/default/files/Guidelines_MetadataQualityControl.pdf