Lindsey Marchessault from Open Contracting Partnership discusses opening up public contracting through disclosure and data engagement so that public money is spent honestly, fairly and effectively. Marchessault talks about how this is done and the problems that open contracting is trying to address. She provides interesting examples of projects in countries such as Ukraine and Nigeria, and discusses the different roles played by government, the private sector, and civil society in developing impactful and sustainable change. Marchessault also discusses the kind of support and resources available for those who want to implement open contracting, and gives her advice on the most important first step in any open contracting initiative.