Humans interact with and operate different devices and ultimately form impressions, such as like and dislike. In previous research, humans’ impressions of devices with regard to various operations, were not considered. Human impressions are difficult to capture, as they tend to be ambivalent. This study investigates an analysis method that focuses on repeated and not repeated verbalizations during human interface operation. The study included an experiment in which six subjects were asked to freely verbalize their impressions of device operation of two devices in two vehicles. The words from the verbal protocols are analyzed using concept networks that are formed of associative word pairs. This analysis outlines a complex associative layer of impressions that the verbalizations are drawn from. The result suggests that the impressions from both verbalization types—repeated and not repeated—identify undefined issues in the operation of interfaces. Thus, methods for resolving these issues can be formulated.