Statistical literacy is complex and multifaceted. In every country, education and numeracy are a function of a multitude of factors including culture, history, and societal norms. Nevertheless, since the launch of the International Statistical Poster Competition (ISLP) in 1994, a number of patterns have emerged to suggest there are some common or universal success factors in running statistical literacy competitions involving schools, universities, statistical offices, and many other institutions. This paper outlines some of those factors, such as institutional cooperation, celebrating participation and success, improvement of statistical literacy in the local schools, support for teachers, the involvement of national statistics institutes, and use of technology. These factors have been identified from our own experience running the competition and from articles submitted to the ISLP newsletters. Statistical literacy is a complex phenomenon, and so this is neither an exhaustive list of key factors nor a formula for success, but rather an overview of recurring themes across countries participating in the competition around the world.