This document provides an overview of the methodology used in developing the Scale-Up Report on UK Economic Growth. It involved forming expert committees to guide the work, reviewing academic literature on business growth, conducting workshops and interviews with hundreds of practitioners and policymakers, surveying over 300 scale-up leaders, analyzing over 75 initiatives supporting scale-ups, and commissioning analyses of the potential economic impacts of closing the UK's scale-up gap. The report aims to understand barriers to business growth and provide recommendations based on extensive research and stakeholder input.