This book is dedicated to the topic of generating data using the think aloud method. It updates and extends a collection of German papers published more than a decade ago. This predecessor to the present book focused on the cognitive processes involved when respondents answer items of personality questionnaires. It collected works by researchers from the Psychology Department of Saarland University. The major goal back then was to provide an introduction to the think aloud method and to exemplify how the method can be used in the evaluation of questionnaire items.