Construction and infrastructure are among the sector more exposed to corruption and increasingly takes place in countries and regions with low transparency. In our experience all major international construction companies and developers of significant infrastructure projects carry out assessments of their third parties, or at least of some of them. However, this is usually conducted in an unstructured way, without standard procedures, leading to time and cost inefficiencies. In this article, Stephen Watson and Javier Serra of Arthur D. Little, explain why a risk-based due diligence approach is required to detect and prevent these risks.