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The chapter proposes a preliminary delineation of Vygotsky's theory. More concretely, the chapter addresses the question of the core subject matters in Vygotsky's creative laboratory. It is argued that consciousness was the core subject matter of Vygotsky's investigation during different stages of his life course. This key problem in Vygotsky's creative laboratory has been ignored in the domain of psychology as well as in the contemporary Vygotskian academy. Vygotsky was also grappling with the issue of development from a cultural-historical perspective. In the same chapter, the debate about the periodization of the development of Vygotsky's theory is considered critically. The treatment of Vygotsky's theory in historical perspective is also proposed as a developing research project.