The influence and knowledge of European law is of crucial importance for citizens, entrepreneurs, legal entities, practitioners and scientists, because it applies directly or indirectly to everyone. Initially, the sources, fundamental principles and standards of European administrative (procedural) law will be briefly highlighted. . The compatibility of Croatian solutions and institutes with selected systems of EU member states will be compared, and new normative solutions will be proposed with the aim of improving and simplifying administrative procedures and decision-making. Special emphasis will be placed on the influence and implications of European administrative (procedural) law on national administrative systems with an emphasis on Croatian administrative procedure. At the same time, similarities and differences in the organization and system of competent bodies in the implementation of European and national administrative procedures will be pointed out. Furthermore, the following concepts and their legal regulation will be analyzed: administrative (loyal) cooperation, good administration, administrative tradition, procedural effectiveness and efficiency, national procedural autonomy, effective application of European law, legal protection mechanisms, etc. The challenges of administrative bodies will be pointed out. and administrative courts in ensuring effective legal protection and specificities in Croatian administrative law and EU law. In particular, the importance of the right to access to justice and the right to good administration is emphasized. The relationship of dialogue and cooperation of national administrative courts with the Court of the European Union and the European Court of Human Rights in terms of standards and procedural guarantees prescribed in Art. 6 and 13 of the European Convention and Art. 47. Charter of Fundamental Rights of the EU. Issues related to the implementation of complex administrative procedures and the path to legal protection.

Independently define the general and special institutes of European administrative procedural law, describe the initiation, management and resolution of special administrative procedures and give examples of special areas in which European administrative procedures are carried out, Analyze the course and implementation of special administrative procedures and present specifics and recognize certain inconsistencies and open questions in practice, as well as proposals for measures to improve the system (legal protection mechanisms), Scientifically research issues related to issues of national administrative procedure, especially by synthesizing selected recent and current administrative and administrative-judicial practice and compare it with the regulation of European administrative procedure, Compare the Croatian system with a certain selected system of the EU member state, Critically interpret and analyze selected jurisprudence of the European Court of Human Rights and the Court of the EU regarding procedural administrative standards and guarantees of administrative treatment, Conduct research using critical thinking and argumentation and publicly present and justify points of view and conclusions on a selected topic from the field of European administrative procedural law,