The aim of this research is to examine the extent to which the Republic of Croatia respects the obligations undertaken and to which extent the current national legislation is harmonized with the acquis of the EU, convention law and selected comparative legal systems; as well as point out certain open questions and doubts and gaps arising from practice, as well as sub-standards in the current legislation. The purpose is to contribute to the improvement and advancement of the current and existing legal framework through the results of research from various legal branches, thus contributing to a critical review of the adequacy of the Croatian positive legal solutions and to the proposal and design of possible normative interventions. The above is in favour of avoiding uneven judicial and administrative practice, uneven interpretation and application of law, eliminating legal uncertainty and inequality of the position of citizens in exercising their rights and ensuring adequate and appropriate legal protection. The purpose of the proposed research is to strengthen the research infrastructure through the implementation of scientific legal research focusing on the critical analysis of the application and enforcement of European Union (EU) law and convention law in the Republic of Croatia. The project has a clear ambition to contribute to the development of scientific thought, but also to concretely influence the improvement of the current legal framework, through the identification of normative and practical shortcomings and the proposal of concrete solutions.