Criterion validity can be measured using two main approaches:
Concurrent Validity: This involves comparing the assessment tool with a well-established measure at the same time. For instance, a new cognitive development test could be validated by comparing its results with those from a widely accepted cognitive assessment. Predictive Validity: This involves assessing how well the tool predicts future outcomes. For example, an early language development screener could be evaluated by looking at how well it predicts language skills at age five.
