This technical note, "A Personal Computer for Children of All Ages" by Alan C. Kay, speculates on the future development and societal impact of personal, portable information manipulators—what he dubs the "DynaBook." Kay envisions the DynaBook as an active and expressive medium, superior to passive tools like the book, that serves as a tool, toy, and medium of expression for both children and adults. Drawing heavily on the developmental theories of Piaget and Papert, the author argues that technology should augment learning by treating the child as an "actor rather than an object," fostering creativity and intuitive understanding rather than simply administering programmed instruction. The latter half of the document provides a detailed, forward-looking assessment of the then-current technology, arguing that a functional, affordable DynaBook (projected at around $500) incorporating a flat-panel display, vast file storage, and a user-centric programming language is a technologically feasible and desirable goal.