In the literature on the impact of gender quota party magnitude appears as one of the most critical explanatory variables. A high party magnitude has long been argued to be a necessary condition for quota to be effective. However, recently a number of studies have shown that gender quota can be equally effective in the case of low party magnitude. An analysis of the Belgian regional elections for the years 1999, 2004 and 2009 shows that for quota to be effective it is crucial that they are tailored to the electoral system in which they are applied. Quota prove to be particularly effective when party magnitude is high while a placement mandate is effective when it covers a substantial part of the eligible list positions. We therefore conclude that effective quota can be designed for both high and low party magnitude.