What's a good company? Environmental, Social and Governance (ESG) investing is transforming the world of business and finance. Investors are using data on issues like climate and diversity to enhance returns and make an impact. But with scepticism creeping in, how far can we trust the numbers? Is all this data making a difference to people and planet, and have we actually lost sight of what we are measuring and why? Measuring Good Business explains what we can measure - and calls for honesty about what we can't. This is the first book to look at the numbers behind the ESG revolution. It sets out a bold blueprint to revolutionise the data based on bottom-up, inclusive metrics, customised data to meet investor needs and impact measures that put sustainability in context. It is essential reading for anyone creating, using or studying ESG and sustainability data. After unpacking what's going on today, the book focuses on solutions, providing a how-to guide to improve measurement and make sustainable business more impactful. It shows why measurement matters in a highly accessible way through stories and insights based on practical experience. The book is relevant to a broad readership of data creators (e.g. those working in companies), users (e.g. capital market participants) as well as the large ecosystem of raters, rankers and standard setters across the private, public and non-profit worlds.