In a study investigating the nature of questioning, a group of subjects with little relevant knowledge and a group with a great deal of relevant knowledge were asked to prepare a chocolate mousse. During the preparation, the subjects were allowed to ask any number of questions and each was answered immediately. Results showed that the number of questions was distributed over the preknowledge variable according to an inverted U-shape. The proportion of contents of several questions interacted with the preknowledge in predicted ways. These predictions were based on a special knowledge model that assumed that the subjects mentally represented a structure of subactions. (German text with English abstract.) (Author/FL)