For all data systems, there must be a mechanism to access documentation of the system’s table structure and data elements. In addition, for systems that are part of routine data collection and reporting, data element dictionaries should be maintained that include:

  • Data definitions;
  • Metadata including data sources and security classifications;
  • Business practices where applicable;
  • Any validations or quality checks applied against the elements;
  • Change history; and,
  • Valid values.