Complex care is a research concept and methodological approach focused on understanding and managing situations characterized by multiple, interacting, and often unpredictable factors. It investigates the intricate interplay of biological, psychological, social, and systemic determinants, emphasizing integrated, interdisciplinary, and person-centered strategies. This approach is significant for addressing multifaceted challenges in domains like healthcare and social services that require comprehensive, dynamic interventions beyond traditional single-factor or discipline-specific methods, aiming to improve outcomes in complex contexts.