Dr Gina Barney continues her look back through her extensive archives. In the April 2023 issue of Lift Industry News Dr Barney reviewed the results of the idea of engineer Leo Port in 1961 to put the passenger destination lift buttons on the landing, not the lift car. What Port started made huge advances with the introduction of microprocessors. In Part 2 of this series on Call Allocation, Dr Barney explains the principles the Adaptive Call Allocation algorithm published in her book, Lift Traffic Analysis Design and Control in 1977.