 Hello, I'm Marie-Louise. I'm an Impact Evaluation Officer at Global Migration Data Analysis Centre here in Berlin. During these last months, I've been assessing the impact of Cinema Arena, which is a mobile cinema that is going from villages to villages in rural Guinea in order to show the danger of an irregular migration journey. There are generally four phases when we produce a rigorous impact evaluation. The first one is the design stage. You have to really understand what you're trying to assess. So we work very closely with our colleagues who are implementing projects in the field in trying to understand what is the theory of change, what are they trying to achieve, and how. In the case of Guinea, we decided that the best way to have the most accurate results is to use a difference in differences method. So we take a picture of a situation before the info campaign happened, and then we take that picture again after the info campaign, and there we go. The difference is our impact, but to do that is a long way. We start with piloting the project and you take the questionnaire and you test it. You see if the question works, if people understand, if you get the precious data that you need to assess your impact. Once we know that through field visits, through multiple conversations, and actually also a review of the literature, we design our study and we decide which methods to use. And every study deserves its own design. There's not sort of a one-size-fits-all approach. Every design for every country in every study will look slightly different. So the second phase, and probably among the hardest, is the data collection phase.