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pervasive developmentdisorder (PDD)

refers to a group of five disorders characterised by delays inthe development of multiple basic functions includingsocialisation andcommunication. The most commonly known PDD is autism.

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Psychology term of the day

September 28th 2021

cross sectional study

a research design based on selecting representative groupswho vary on a particular characteristic; when thecharacteristic is age, this design provides a means ofmaking developmental comparisons.