The study contains an analysis of municipalties' use of gender mainstreaming in Denmark, Finland, Norway and Sweden. The analysis is based on 21 good practice examples of gender mainstreaming of core services in Nordic municipalities. The study shows that municipalities achieve both results and effects when applying gender mainstreaming. Moreover, the municipalities may achieve results in the form of increased core service quality, resource optimisation and changes in attitude and behaviour. The study also shows that these results lead to greater gender equality (effect).