KEYWORDS: cultural-historical activity theory, dialectics, theory-praxis gap, activity systems, contradictions, learning, development.More than seven decades ago, the Russian psychologist Lev S. Vygotsky (1934Vygotsky ( /1986) noted that (educational) psychology was in a state of crisis because of the "atomistic and functional modes of analysis . . . [that] treated psychic processes in isolation" (p. 1). Specifically, he pointed out that the separation of intellect and affect as subjects of study [was] a major weakness of traditional psychology, since it [made] the thought process appear as an autonomous flow of "thoughts thinking themselves," segregated from the fullness of life, from the personal need and interests, the inclinations and impulses of the thinker. (p. 10) These analytic challenges remained unresolved for years, leading Vygotsky's student A. N. Leont'ev (1978) to continue expressing dissatisfaction over the eclectic state of (educational) psychology. As readers will quickly verify, it is difficult to find research recommendations concerned with knowing and learning in and out of schools and across the life span that take into account the kind of holistic integration that Vygotsky had originally championed. Now, as then, we are confronted with a number of conundrums in educational research and practice, which advances in modern psychology have not fully overcome. To better place these issues in context, we present a short vignette below that conveys something of the multiple tensions facing classroom teachers and educators everywhere.