Improvement of content, methods, classifications and measurements from a gender perspective should be made part of the ongoing efforts to improve all statistical sources - censuses, surveys and administrative systems (Hedman, Perucci and Sundstrom, 1996). Mainstreaming a gender perspective in data collection programmes involves review and revision of the conceptual basis of data collection tools, review and revision of coding and classification systems and terminologies, gender training for all personnel involved in data collection, media campaigns that include gender-specific messages, gender-sensitive selection of field interviewers, and review and revision of tabulations and data presentation and dissemination (Corner, 2003). The presentation and dissemination of gender statistics should reach all potential target groups. Most often, existing data are not fully exploited for obtaining gender statistics (United Nations, 2009).