Is developmental psychology developing and changing to nonlinear dynamic systems?

This paper examines the recent literature about
nonlinear dynamic systems, oriented to developmental
psychology studies. We review concepts as
self-regulation, emergency, non-linearity, and regulated
instability. Specifically we analyze the intraindividual
variability defined as the irregularity in
progresses and setbacks as well as the sequences of
performances to the same situation. This variability
is seen as expression of the same dynamic concept
and specifically as a case of relative instability, a
property of dynamic systems, which is studied in a
spatial planning task. In this case study we used methodologies
that combine a microgenetic approach
with the minimum-and-maximum methodology of
the dynamic systems.