“…The actual developmental level characterizes mental development retrospectively, while the Zone of Proximal Development characterizes mental development prospectively. For example, we may quote a representative list of studies in the two preceding decades that cover in isolation some of the specific issues of developmental robotics: Self-exploration and early imitation (Kuniyoshi et al, 2003), Modeling joint attention (Nagai, 2007), Scaffolding Robot Action Learning (Nagai and Rohlfing, 2009), Affordance-based perception (Min et al, 2016), Bootstrapping the semantics of tools (Schoeler and Wörgötter, 2016), Perception of Localized Features (Giagkos et al, 2017), Bootstrapping of Sensory-Motor Skills (Wieser and Cheng, 2018), Developing Reaching Ability like human infants (Luo et al, 2018), Sensorimotor Communication (Donnarumma et al, 2012(Donnarumma et al, , 2018Pezzulo et al, 2019), Integration of Sensing, Cognition, Learning, and Control (Li et al, 2019), Evaluation of Internal Models (Smith and Herrmann, 2019), Emergence of symbolic representations (Ugur et al, 2015;Taniguchi et al, 2019), Grounded affordances (Saponaro et al, 2020), Bodily Expression of Emotion (Tuyen et al, 2021), Morphological development (Naya-Varela et al, 2021), Skill Learning Strategy with Dynamic Motion Primitives (Li et al, 2021), Interest-driven exploration (Rayyes et al, 2022(Rayyes et al, , 2023.…”