The British Child Health System has been designed and widely implemented to support equity of access to preventive child health services, using case-based integrated records. Lately, telematics has been increasingly applied to improve the timeliness of data entry. A special project has been established to moniter overall quality of the system's use and of the resultant preventive services. The telematics application has been found to be a potential threat to quality in a way which would apply to all remote networked patient-based systems. The demonstration will show the methodology and interim results.