In recent years, provision of relevant up-skilling and re-skilling opportunities for adults has become a necessity due to global megatrends affecting labour markets. As a result, countries are looking to strengthen these opportunities throughout the life course. The successful deployment of these initiatives requires a coherent set of policies, with quality assurance being critically important. This paper provides an overview of quality assurance mechanisms from the perspective of the 38 OECD member countries. It proposes a framework to characterise and compare the governance, processes and outcomes of these mechanisms. The paper's contribution is to facilitate understanding of quality assurance across OECD countries, presenting a visual cross-country mapping that classifies existing mechanisms.