The organisation of the written tests and of the interviews is a significant logistical effort, involving many internal and external actors. It entails booking of rooms and equipment, together with travel and accommodation arrangements. Additional arrangements are required in the case of external Selection Committee members. Not to mention that in the same time several other procedures are taking place and the planning is done taking all these factors into account. So, we really appreciate if you can keep the day/ time slot that has been assigned to you in the invitation letter. In case of force majeure, there is some flexibility in relation to the time slots, but the days have to be respected. Thank you for your understanding and cooperation on this matter.