Disclosed are a system, apparatus, and method for reducing traffic in networked data collection. When data collection is initiated, a server provides a page that includes data fields for completion by a user at the client. One or more of the data fields is configured to respond to changes by transmitting a new value to the server. The server may process the new value and return new data to the client, including an error message, an entry for another data field, or a plurality of entries and a control (e.g., drop-down list, scroll box). The data entry fields may also operate with one another (e.g., data is transmitted to the server only when two or more specific entries are changed). The server maintains an image of the entries so the server may process the entries without re-transmission of a completed form from the client.