This book is the second volume in a series presenting new English translations of L.S. Vygotsky’s writings on the holistic science of the child he called “pedology”. It presents unique materials which reflect the development of Vygotsky’s theoretical position at the last stage of his creative evolution in 1932-1934 and contributes to the number of original Vygotsky texts available in English. It includes the problem of age and age periodization; the structure and dynamics of age, psychological characteristics of age crises and diagnostics of development in relation to age, and the...