This document summarizes Nielsen's mobile brand effect (MBE) framework for measuring the effectiveness of mobile advertising campaigns. MBE helps clients measure how exposure to mobile display ads influences brand metrics like awareness, purchase intent, and preference. It works by surveying people about brands, then analyzing differences between responses from those exposed to ads versus an unexposed control group. The document presents MBE study results for Gillette, iGaranti, and Shell mobile ad campaigns, showing increases in awareness, recall, and purchase intent attributable to ad exposure.