Open Uncontrolled Validation Study for the German Version of the Actinic Keratosis Quality of Life Questionnaire (AKQoL)

"For the individual cognitive interviews we are using the two techniques to think aloud and the verbal probing. To think aloud means, that the patients are asked to express precisely what comes to their mind when reading the single questions. This means, the interviewer is interested in the line of thoughts, which arise when reading the question. Thereby, the problems which appear in the usually covert process of answering a question should be revealed. In a second step, we are using the verbal probing technique to identify possible misunderstandings of the questions or difficulties with single phrases. The interviewer asks further questions that target the patients' interpretation."