In 2001, competitive tendering was introduced for most concessions in the Netherlands, to be carried out by regional authorities. These authorities received a great deal of freedom to implement the tendering in the way they saw fit. Over the years, issues arose that challenged the effectiveness of the tendering approaches. This article, as its precursors in earlier Thredbo conferences, captures these issues and the lessons drawn over the last 15 years and shows in what phases tendering has matured, based on the Dutch experience, that could help other authorities in the process of tuning their tendering of public transport.