A method of enhancing the quality of data stored in a system includes receiving data from a first data enterer, accepting data received from the first data enterer into the system if the data are entered in a format compliant with a first set of rules, receiving first additional data from a second data enterer, the first additional data being related to the data received from the first data enterer, and accepting first additional data received from the second data enterer into the system if the data are entered in a format compliant with a second set of rules.