Wherever pheno.txt is a file that contains three columns (a single row for every unique): Family ID Individual ID Phenotype The first PED file must continue to have a phenotype in column 6 (even Fidelity takes advantage of a similar concept on its self-assistance Internet site, featuring “prompt following actions” http://erickapcnw.timeblog.net/9166800/detailed-notes-on-harvard-case-solution