The project was based around the data from a large scale opinion poll survey in which respondents were asked to <i>vote</i> again on ballot papers for the main electoral systems which are candidates for adoption for elections to the House of Commons. The four alternative systems under which respondents <i>voted</i> were the single transferable vote (STV); the alternative vote (AV); the supplementary vote (SV); and the additional member system (AMS). Various attitude questions were also asked. Data from this survey formed the basis for detailed simulations of how different systems would have operated in the general elections.