Marginal A quality assessment has been made and one or more data quality objectives has not been met. The observation may be suspect and has been assessed to be of marginal quality. No data quality assessment has been made. None The quality of the observation is unknown. Unknown ODM2 Quality Code Controlled Vocabulary ODM2 Working Group A vocabulary for describing the quality of the observation. A quality assessment has been made and enough of the data quality objectives have not been met that the observation has been assessed to be of bad quality. Bad Good A quality assessment has been made and all data quality objectives have been met.