The Role of Constraints in Development
One potential problem with the development cascades approach is that it appears to be unconstrained. However, as discussed in this chapter, constraints in development can be broadly defined. Constraints have typically been conceived of as either innate and present at birth or acquired through experience. This chapter argues instead that developmental cascades are influenced profoundly by different kinds of constraints that do not have a single foundation. Constraints can be structural (e.g., originating from the structure of the child’s nervous system and body), a function of the physical or social environment, or the result of accumulated knowledge and experience. These constraints, it is argued, occur at multiple levels of processing and change over time, both of which contribute to developmental cascades and are the product of cascades.