It was 2007, and a candidate for head of school had a question for the faculty: "What do you want as a school?" A veteran teacher raised his hand. "We want a faculty and staff evaluation program." Hearing this response, the candidate decided, "This is a place I want to work." Within a year, newly installed McDonogh School (Maryland) Head Charlie Britton had a committee hard at work on a new system, charging them with one primary aim: "Evaluation programs fall apart because they're too complicated," Britton said. "I want our program to be 'caveman simple'!" Committee members recall a table pounded for emphasis. The evaluation committee at McDonogh managed one of the more promising breakthroughs in teacher evaluation. Not only are teachers at McDonogh enthusiastic about the program, but word has also gotten out about McDonogh's efforts. At the opening of school this year, nearly 50 schools were sharing the fruits of Britton's mandate through membership in a new nonprofit, the Folio Collaborative--a consortium of schools dedicated to professional growth and to redefining teacher evaluation. This article begins by describing how the Folio Collaborative was first established. It goes on to discuss how the Folio app and customizable modules work and the types of institutional conversations that the app encourages. Finally, critical goals of the Folio Collaborative are reviewed.