The development and the elements of a standardised Integrated Task Analysis (ITA) procedures are described. The main purpose of this task analysis is to describe the job and tasks of Air Traffic Controllers (ATCOs) from a perspective which focuses on the cognitive processes. Its main aim is to throw some light on the processes which take place in the controllers mind while he is working. For this purpose a cognitive interview has been developed, which addresses the controllers information processing for different tasks. The interview is supplemented by a set of observational methods. A flight-progress reconstruction interview links the results of the interview to those of the more classical task observation. To complete the methods, an interview addressing organisational aspects and some methods for assessing the controllers workload and stress are provided.