For nine years we've been talking to former NBA head coaches, current head coaches and future head coaches about the job that just 30 people in the world occupy: How is it changing? What did you know in Season 5 that you didn't know in Season 1? What is the job fundamentally? We've asked current and former players for the qualities they most value in a head coach. We've asked front-office executives how where their team is in its life cycle dictates the profile of the coach they pursue. We've asked agents which trends they've noticed in the hiring process.