The participants meet annually in Aberdeen to consider the Reviews and discuss/agree upon any revisions they require for the following year, ensuring that the Reviews continue to evolve and grow. 1994 saw the establishment of the Completions Performance Review (CPR), now containing information and schematics on the completion of over 12,000 offset wells in over 60 countries. Following an increasing number of well abandonments, demand grew among participants for the Abandonment Performance Review (APR) which began in 2008. The APR contains data for over 300 permanently abandoned wells, mainly situated in Europe.