What is the best way to ensure you have high quality data?

Do corrective action after a problem has occurred because data only needs to be 'fit for use'

Inspect all data that is in production and get the business areas to certify that the data is correct

Implement Data Governance and Stewardship

Create drop-down menus for data entry to prevent all invalid data

Instruct users of data in downstream systems flag data errors and put them in a error log