Marja-Liisa Siikonen is the convenor of the TC178 WG6 SG5 to drafts the document ISO DIS 8100-32. She received her M.Sc. in technical physics from Helsinki University of Technology. Later she obtained her Lic.Sc. (Tech.) and D.Sc. (Tech.) degree in applied mathematics from Helsinki University of Technology. She has published numerous articles and patents in the field of lift control systems and, lift traffic planning, building traffic simulation and evacuation, and people flow in buildings. The latest research interests are on people movement inside buildings, their social behaviour and lift energy consumption.