Following on the success of last year’s ACI EUROPE Airport Economics Workshop, a second Special Workshop on Economic Regulation & the Key Performance Indicators (KPI) project was organised by ACI EUROPE in September 2010. The workshop took place over a day and half at the ACI EUROPE offices in Brussels on 20 and 21 September. Registration was limited to members of ACI EUROPE, but the workshop was completely free. Some 40 participants from over 30 airports attended the workshop.