This document discusses the why, what, and how of marketing measurement. It explains that proactive measurement leads to insights that assess campaign value and focus, benchmark performance, gauge market trends, and evaluate audiences. These insights allow optimal alignment of marketing with strategic goals. Measurement is the starting point for gaining insights that drive better business decisions and marketing effectiveness. The document provides guidance on establishing best practices, determining supporting technology, defining measurement plans for campaigns, and determining a measurement framework. It also discusses challenges like information hoarding and how to address them.