1. Apparatus for reducing infrastructure failure rates, the apparatus comprising: machine memory storing a first array of infrastructure change element attributes and a second array of change element tallies, each tally corresponding to one of the change element attributes and corresponding to a number of change elements having a respective attribute, the first and second arrays being based on a plurality of historical change records; and a processor that is configured to: select one or more of the change element attributes based on the corresponding tallies; select one of the plurality of historical change records; and enter into the selected one of the historical change records a Boolean variable corresponding to each of the one or more selected change element attributes.