The number of jurisdictions across the globe with a competition law regime has increased dramatically over the last couple of decades and many of these regimes include rules on abuse of dominance. Competition agencies in jurisdictions with long-established antitrust regimes (such as the EU, UK and US) have used these rules to impose significant fines on firms with a dominant market position. Enforcement has also picked up in jurisdictions with more recent regimes, such as China. This is a foreword to a database of commentary on decisional practice and case law in the area of abuse of dominance covering over 35 sectors, including pharmaceuticals, transport, utilities, distribution/retail, information technology and online platforms. The focus of the database is on Europe but the database also includes commentary on cases and developments in other jurisdictions such as Brazil, Canada, China, India, Japan, Mexico, Russia, South Africa and the US. Figure 1 below contains a complete list of the sectors and jurisdictions covered. This foreword discusses legal developments up until and including 9 March 2020.