The interview was with a panel of 3. Two economists, one research analyst. They asked mainly about my CV and then some behavioral questions. The people were really friendly. They don't pressure you nor give you hard time. Prepare to answer common questions like "Tell me about you", "tell one difficulty you met and how you solved it". Also, prepare to brief any paper you have on your CV. Mine interview wasn't technical probably because I worked as an research assistant before. Definitely prepare more examples from your similar working experience cause they are going to be really interested in it.