In this case, the P.O. was in charge of defining profiles of the users recruited, and writing guidelines for the interviews where we wanted to confirm some hypothesis, validate features and test an interactive prototype. We had 4 rounds of interviews at least once a week in London, the P.O. made questions to the users related to credit cards, and how did they manage them, and I took notes of all relevant information being said by the users. The last part of the interview was focused on the the user testing the prototype, while giving feedback out loud on everything they saw, thought, felt, liked and disliked. After asking the user to run some tasks on the prototype, the P.O. would ask some specific questions related to the product, for example if they knew any similar product or service, if it was usable and what kind of user they imagine using this product.