There is growing concern, across a wide range of countries, about the levels of financial capability of consumers. A large number of initiatives are therefore being developed to address this issue; and countries are increasingly rolling out national strategies on financial capability. To do this effectively requires evidence on the areas where financial capability in the population is low and an identification of the extent to which these should be addressed by financial education and/or consumer protection measures. Yet there is remarkably little robust information in this area and none that is comparable across countries. This report is aimed at informing the work of the OECD International Network on Financial Education (INFE) in this field, by 1) elaborating a set of draft good practice guidelines for the design of national financial literacy surveys and; 2) proposing guidelines for the design of a core set of good practice questions for embedding within any national surveys aimed at measuring financial literacy levels.