Impact analysis is a critical dimension in all ICT4D projects. How do you measure a specific project impact, what are the factors to consider, and appropriate methodologies to use are key questions. While this topic is wider than just mobile applications, there is no well established methodology to measure the social impact of a specific service. This document will analyze the current methodologies used in ICT4D projects to assess impact and results, evaluate their applicability in the mobile space, identify the key factors to take into account to measure social impact, and how to measure them.