Apart from the procedural information that describes how a device should be operated, instructions for use include different types of declarative information, such as information about the internal working of the device (system information) and information about the circumstances in which the different functions can be used (utilization information). In this study, the use and the effects of system and utilization information are investigated in a number of experiments. The results demonstrate that users spend a considerable amount of time on reading each information type. However, contrary...