This document summarizes Nielsen's approach to measuring marketing effectiveness. It discusses how Nielsen uses statistical analysis to understand sales drivers for thousands of brands worldwide and measure the impact of over $10 billion in annual media investments. It shows how Nielsen can determine the ROI of different marketing executions and media types. It also provides examples of how dual-platform advertising, online video ads, and social media exposures can enhance TV ad performance. Finally, it discusses how Nielsen helps clients optimize their marketing plans and spending allocation based on insights from its analyses.