This book examines significant issues shaping the European Union’s (EU) enlargement process from diverse perspectives. The first chapter highlights the critical role of energy in EU policies and how access to energy resources affects relations between countries. It analyzes the relationship between economic growth and energy using econometric methods, offering policy recommendations. The second chapter assesses the quality of agri-food imports from Türkiye to the EU, particularly through RASFF (Rapid Alert System for Food and Feed) notifications. It examines food safety risks, product categories, and potential areas of cooperation, evaluating their impact on Türkiye’s export performance. The third chapter analyzes the digital transformation process in the Portuguese public administration from a systems perspective. It explores the integration of technological infrastructure, organizational capacity, and environmental factors, presenting a framework for sustainable digital transformation. This book aims to provide valuable insights to policymakers and academics by deeply examining the complex dynamics of the EU enlargement process in critical areas such as energy, food safety, and digital transformation.