In contemporary political sociology, a distinction is often made between "positive" and "negative" national pride (patriotism and nationalism). In this article, we examine whether this theoretical distinction can be verified empirically using data of the International Social Survey Programme 2003. In a first step, statistical tests of criterion validity and construct validity of the "nationalism" and "patriotism" scale are carried out. Thereafter, we present results of a qualitative pilot study in which respondents after having filled out the ISSP-questionnaire were asked to explain their answers and how they understood the questions. Finally, we tried to identify additional aspects of the topic which are, as a rule, not considered in conventional analyses, and to clarify parts of its conceptual logic by using prose fiction as a relevant source. Considering the inconsistencies both in the quantitative and in the qualitative analyses, the question arises whether a strict distinction between nationalism and patriotism is theoretically meaningful and whether the customary way of measuring these constructs is empirically valid.