A large part of this study is based on data collected in 2011 in five focus countries of the MENA region. In addition, other existing data sources were used as well, as documented in the various chapters that follow, but this need not be discussed in this chapter. This chapter documents the process followed and some of the choices made for new data collection, both quantitative and qualitative, for the study on climate change and migration in the MENA region. After a brief introduction, we explain the nature of the household survey questionnaire, what it enables us to document, as well as some of its limits. Next, we explain how the household survey sites were selected and how the samples were constructed in each of the five focus countries. We also provide a few comments on the challenges encountered during survey implementation. The chapter finally explains the process used for the focus group discussions and in-depth interview, as well as for the interviews with key informants conducted in each country