The expression of memory worries and the self-reporting of daily forgetfulness easily spark discussion among sufferers and their family or friends about what is normal or abnormal forgetfulness. One way to investigate whether the reporting of forgetfulness might be excessive is to use a standardized memory questionnaire--for instance, the Multifactorial Memory Questionnaire (MMQ). The MMQ measures worries, daily forgetfulness, and memory strategy use. In this study we present a psychometric evaluation of the Dutch translation of the MMQ and provide normative data to determine the significance of individual differences in subtest scores. In addition, clinical examples are given of the use and interpretation of percentile norms and single-case statistics.