For all the power that data analysis represents—and I’ve worked to build a reputation for running one of the country’s most data-oriented city administrations—it also has its limitations, and the potential for mischief. You might spend lots of time and resources gathering data that will never be used, or accumulate data that winds up telling you things you already know. SO HOW DOES A TECH-ORIENTED MAYOR make sure that the data is serving the administration, rather than becoming an end in itself?