While it probably biases the numbers a bit, I don't fault the study for picking people who were receptive to new practices. Picking people randomly and forcing

While it probably biases the numbers a bit, I don't fault the study for picking people who were receptive to new practices. Picking people randomly and forcing them to change practices would just cause resentment. Even though I enjoy pairing, I also doubt I would enjoy working at a place that required people to pair. Rules like that irk me. They're often a symptom of other, bigger problems.