Tailoring Advanced Technologies for Air Traffic Control: The Importance of the Development Process Beverly D. Sanford, Kelly Harwood, and Katharine K. Lee Abstract This paper describes a process that is currently being applied to the development and assessment of an advanced air traffic control (ATC) system, the Center TRACON Automation System (CTAS). This process deviates from established practices of ATC system development: iterative field testing is conducted early in development rather than later during production, where such testing is regarded as an implementation endpoint. Progressive human factors assessments in the laboratory and at ATC field sites are conducted with retired and active controllers. Development and assessment activities are tailored to accommodate the specific requirements of each CTAS tool and ATC environment. CTAS is the first US advanced ATC automation system of its scope and complexity to undergo this type of development and assessment process.