According to Lev S. Vygotsky, the highest levels of abstract thinking and self-regulation in preschool development are established in pretend play using object substitutions. Vygotsky also introduced an entirely new way of assessing the child’s ability to learn by using the assistance of a more knowledgeable person – the zone of proximal development. These concepts are fundamental to Vygotsky’s theory of how consciously directed mental functions develop as neurological systems. Francine Smolucha, Ph.D., has publications that include her translations of Vygotsky’s writings and her own original research on creativity, pretend play, and private speech. She has co-authored numerous research monographs on Vygotsky and creativity. Smolucha and Smolucha introduced Synergistic Psychology as a synthesis of major psychological theories using Vygotsky’s model of verbal interactions as the key unifying concept. Their most recent publication advancing Synergistic Psychology was Smolucha and Smolucha. Vygotsky’s empirical model of the internalization of self-guiding speech is also supported by an extensive research literature.