The review concerns Karol Weitz's monograph "National Jurisdiction in Civil Proceedings," which formed the basis of his habilitation. The author analyzes national jurisdiction as a legal institution, its place in the system of civil procedure, and specific issues related to its functions and significance. The reviewer positively assesses the distinction between international jurisdiction and jurisdictional authority, the analysis of the forum non conveniens concept, and the discussion of jurisdictional conflicts. However, he is critical of the solution regarding the lack of national jurisdiction resulting from an agreement on the jurisdiction of foreign courts. The overall assessment of the dissertation is highly positive, and the reviewer expresses confidence that the author's concepts will be permanently incorporated into Polish doctrine.