in a busy clinical practice, monitoring physical activity by direct measures such as accelerometers or pedometers is too time- consuming, so questionnaires are used in most cases. The self-report method, however, needs to be short, simple for the respondents to understand and answer, and easy to adminis- ter. To evaluate if the method of choice is relevant for use in a clinical setting, the study needs to be planned in close coop- eration with the clinicians and conducted in a similar way to the clinical context in which the instrument is intended to be used