Both de Groeve and O’Quinn were compsci majors and by the end of first semester had cowritten a program for Concentives that enabled the mystery shopping company to automatically tabulate upsell results and implement a general rating system, both by mall and by franchises of chains among malls. However, they were still having a problem with standardizing, not to mention automating, the evaluations of the written portion of each assessment and, having related the particulars to Cohen as they packed for the holidays, left—de Groeve to Hong Kong, O’Quinn to Philadelphia. Cohen remained in his dorm throughout winter break, and by the time his roommates returned for second semester he’d engineered a solution. The roommates were stunned. Cohen had broken through their wall, and not just figuratively, but literally. Requiring their stash of written assessments and unable to find his copy of their key amid his mess, he’d borrowed a sledgehammer from maintenance and bashed a crude passage into the plaster shared between their rooms.