This chapter presents an updated discussion of the theory of subjectivity, focusing on its implications for research and for psychological practice. It begins with a brief history of the development of the theory and the effort to advance the epistemological and methodological character of its concepts. The text then turns to the current theoretical relevance of the concepts and highlights the configurational nature of subjectivity, which allows for understanding psychological processes as dynamic, complex, and historically situated productions. This chapter also explores the concepts of agent and subject, clarifying how individuals participate actively in social life, not merely adapting to circumstances but creating new processes of subjectivation. Finally, special attention is given to the refinement of the concept of social subjectivity, which is defined as a configurational system that integrates individual and collective dimensions, resisting deterministic or reductionist explanations. Drawing on examples from family, education, and broader social practices, this chapter argues for a constructive-interpretive approach builds intelligibility of how subjective senses emerge within the tensions between reproduction and creativity. Overall, this chapter affirms the vitality of the theory of subjectivity for contemporary research and psychological practice.