May 07, 2002 The file effctspd.xls is an EXCEL format spreadsheet. It is a simplified math model allowing an individual apply his/her own specific conditions to the Social Speed hypothesis as presented in Ivan Illich's essay "Energy and Equity". No claims of the spreadsheet's accuracy are made or implied by the author. The file's output should be regarded only as a medium for exploring a concept. John Snyder JCSnyder.studio@worldnet.att.net