In 1973, a group of researchers at the Science Policy Research Unit at the University of Sussex, published "Thinking about the Future; A Critique of The Limits to Growth", published in the United States as "Models of Doom". The Sussex group examined the structure and assumptions of the MIT models. They concluded that the simulations were very sensitive to a few key assumptions and suggest that the MIT assumptions were unduly pessimistic. The Sussex scientists expressed their opinion that the MIT methodology, data, and projections were faulty and do not accurately reflect reality. Some of the criticism was however recognized as valid and improving overall understanding of dynamic models, for example actual issue of "backcasting" the World3 model, which retrospectively "predicted" a huge drop in industrial production in 1880, which obviously did not happen. In the Acknowledgements section, the Sussex Group thanked their sponsors, which included BP, Imperial Chemical Industries and the UKAEA.