This document introduces the concept of brand architecture and the brand relationship spectrum. It discusses how brand managers now face more complex brand structures and portfolios due to market changes. It defines brand architecture as the organizing structure that specifies relationships between brands in a portfolio. The brand relationship spectrum is presented as a tool with 9 strategies to help strategists employ subbrands and endorsed brands to address these challenges. It discusses how the spectrum relates to the driver role brands play for customers and ranges from house of brands to branded house strategies.