 The Reviews began in 1993 when a group of oil operators, led by BP, outsourced the production of the data collection and analysis project they had been conducting since 1988 to the Rushmore Reviews.This was a joint venture between two independent companies, Rushmore Associates Ltd (founded by Peter and Helen Rushmore) and the Sigma Consultancy (founded by Tim Stapenhurst and wife Pat).They shared offices and provided data to participants through a web-based portal.