In 2011, the Swedish National Agency for Education initiated a national project to test and try out teaching methods that focused on achieving gender mainstreaming in preschools and schools in Sweden. With a mandate from the Swedish government, preschools and compulsory schools could apply to enhance gender equality in their institutions. The participating preschools and schools were required to cooperate with colleagues and other school staff in order to try out different methods aimed at achieving gender mainstream teaching. The national project was mainly carried out during the spring of 2012 and the project was completed that autumn. This paper presents the results from this national development endeavour and reflects on the educational, gender related challenges such a project raises. The aim of this paper is to show what a national project can achieve, and what effects a relatively short project can hope to have, in terms of teaching and teachers’ level of knowledge concerning gender mainstreaming.