Long-term panel surveys such as the LifE study are often confronted with various problems at the outset. One of the biggest challenges is to rediscover former interviewees and attract them to participate in the survey once more. Often several years have passed since the last survey took place, without any possibility of establishing contacts and while test persons might have changed their places of residence several times. What’s more, it often requires strong persuasion to revive the interest in the study and to solve raising concerns about the misuse of personal data. Failures are therefore often inevitable.