Air traffic control complexity and safety: A framework for sector design based upon controller interviews of complexity factors by Dr. Arnab Majumdar and Professor Washington Yotto Ochieng……click here for insightful findings on various ATC (Air Traffic Controller) complexity variables and its impact on controller workload and safety. Seventy nine air traffic controllers were interviewed face-to-face as to understand what factors affect their workload and how they do so. These controllers were based in 14 Area Control Centres in Europe, including those of high traffic complexity, e.g. Maastricht, Geneva, as well as in nine centres in Asia and one in Africa, e.g. Mumbai, a region that has seen remarkable traffic growth in recent years.