Legislative studies research often insists on the weakness of the French Parliament compared with the executive. Yet very little qualitative and quantitative empirical research has been done into the work of deputies in the French National Assembly, or into the institution's role in policy and law-making. This article addresses these research gaps by first analysing the characteristics and drivers of French MPs' involvement in law-making rather than in other parliamentary activities, either in the Parliament or in their constituency. Second, it takes an original approach by comparing MPs' perceptions of their activities with those of their electorate through the use of mixed-method analyses (open and closed questionnaires with 230 MPs; 13 focus groups with ordinary citizens). This is indeed a crucial issue in order to better understand the causes fuelling citizens' criticism of their representatives.