This document discusses how challenger brands can compete against larger, more established brand leaders. It provides 8 credos or principles for successful challenger behavior: 1) Intelligent Naivety - challenging assumptions without experience in a category, 2) Build a Lighthouse Identity - having a clear point of view and standing out through consistency, 3) Become the Thought Leader - breaking conventions to set the agenda, 4) Create a Symbol of Re-evaluation - prompting consumers to rethink the category, 5) Sacrifice - focusing intensely on preferred audiences even if it means losing others, 6) Overcommit - exceeding expectations especially on what matters most, 7) Enter Popular Culture - engaging consumers through peer interactions, 8) Become