 The book remained unfinished until Mumford, who had previously been in contact with Molnar, in the summer of 1999, with the intention of giving feedback on the work (nearing completion), was approached to edit the remaining manuscript into a completed book.Mumford, along with several other figures in the field of metaphysics, including David Armstrong, were involved collaboratively in providing insight on Molnar's work, and as a person, but the editing was left to Mumford, as was the writing of an introductory chapter to correctly present and establish the material laid out - something which Molnar did not get round to doing before his death.Armstrong states, "We can be very grateful to Stephen Mumford for making a volume from the much that we have.