The document discusses tools for collecting quantitative data, specifically the development of questionnaires. It provides two examples of developing questionnaires for studies on violence against women. The WHO multi-country study questionnaire was developed over many years through an extensive process of literature review, expert consultation, translation, pilot testing and revision to improve cross-cultural comparability. It includes questions on health outcomes, consequences of violence, and women's responses to violence. The South Africa study similarly involved focus groups, pilot testing and incorporating local expressions of mental distress to develop a culturally appropriate questionnaire.