This chapter intends to complement this literature by proposing an OECD wide multi-country transversal comparison of policy approaches. The questionnaire was structured into three parts, with the first providing general information on the respondent. The second focused on characterising the status and use of groundwater resource in agriculture at the national and sub-national level, mostly to feed into Chapter 1. Respondents were asked to select one to four groundwater regional units (henceforth called regions) for which they could provide more information about groundwater use and the constraints thereof.