The integration of emotional adaptation and behavior change support into interactive technologies has emerged as a critical research frontier across Human-Computer Interaction (HCI), Affective Computing, Intelligent Systems, and Behavioral Science. As intelligent artifacts such as robots and artificial agents increasingly become embedded in everyday life — supporting education, healthcare, communication, and social interaction — understanding how these systems can dynamically respond to human emotions and social contexts is vital for building trust, empathy, and sustainable engagement.

This Methods Collection invites contributions presenting experimental protocols, design methodologies, and technical innovations that advance reproducible research in fields such as human-robot interaction (HRI), human-agent interaction (HAI), affective adaptive systems, and behavior change interventions through interactive technologies. Submissions related to affective sensing, persuasive systems for everyday behavior change, adaptive educational, healthcare, and communication support technologies, and emotional adaptation of artificial agents are particularly encouraged.

We welcome a wide range of contributions from diverse but related fields, including studies addressing human-centered AI, behavior change technologies, emotional interaction design, and socially intelligent systems. By highlighting reproducible methods and protocols, this Collection aims to foster the development of empathetic, trustworthy, and supportive systems that empower users and promote well-being across various real-world contexts.