Validity is generally defined as the credibility of research-based evidence. There are two main kinds of evidence: rational evidence (i.e., philosophical views coupled with compatible theoretical perspectives) and empirical evidence (i.e., data). There are two basic kinds of data: relevant data and raw data (i.e., any data which lack relevancy). Relevancy can be established in two basic ways: relevance to an individual and relevance to the scholarly literature. Additionally, statistical relevance is defined by levels of confidence. This entry provides an overview of constructionism and compatible theories of language, then examines construct validity, assessment power, and how to assess pre-grammatical and grammatical individuals.


The seven basic philosophical views of cognitive and language acquisition have been examined with respect to their underlying assumptions and propositions. These views ...

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