Abstract
The goal of this special issue of PTJ was to gather together a set of articles focusing on several aspects of intra-individual variability during infancy and childhood. Intra-individual variability can be defined as differences in motor development or performance within individuals and between repeated measurements. The term “fluctuations” is reserved for differences among consecutive points in a variable trajectory, whereas “stability indicates the counterpart of (or the lack of) variability.”1 One of the reasons why variability in childhood development is receiving attention lies in the introduction of new theoretical viewpoints, namely dynamic systems theory and Neuronal Group Selection Theory. Thelen and Smith2 were among the first to apply the dynamic systems approach to childhood development. The dynamic approach turns variability within and between individuals into an essential element in the developmental process. Variability is considered to be the harbinger of …
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