What is the focus of generalizability or domain sampling theory?

The focus of generalizability or domain sampling theory is on identifying specific sources of variation under defined conditions. This theory posits that measurements can vary due to different factors, and it seeks to understand how these variations affect the outcomes of assessments. It emphasizes examining various facets of a construct and understanding how they relate to performance or measurements, thereby providing a framework for evaluating how representative and applicable the test results are across different contexts or domains.

By concentrating on the sources of variation, this approach helps researchers and practitioners identify areas where performance may fluctuate, leading to a deeper understanding of the testing instrument's limitations and strengths. This focus on variability is crucial for improving the accuracy and applicability of assessments in various settings.