The authors describe a development of the Czech version of the Over-claiming Questionnaire (OCQ) in relation to the work of Delroy Paulhus. First, the authors created the longer version (OCQ-150) and subsequently the shortened version (OCQ-100), which contains 100 items in 10 knowledge-based categories. Each category includes 8 items, which exist and 2 items, which do not exist. By the calculation of the accuracy index and the bias index we can get information about how much a proband has a tendency to distinguish real concepts from the unreal concepts and how much tendency a proband has to accept the concept or reject it. The test confirmed the ability to differentiate between the participants of selection procedure, who have a high motivation for good performance and those from general population without such a motivation. The authors recommend a further use of OCQ-100 for research, especially in the area of selection procedures. (Fulltext in Czech)