What type of validity evaluates how well a test represents every part of a construct?

Content validity specifically assesses how well a test covers and represents all aspects of a given construct or domain. This type of validity ensures that the test includes a comprehensive range of items that reflect the various dimensions of what is being measured. For example, if a test is designed to measure mathematical skills, it should include questions on addition, subtraction, multiplication, and division to fully represent the construct of mathematics proficiency.

By focusing on the breadth and depth of coverage within a construct, content validity helps to ensure that the conclusions drawn from the test results are accurate and meaningful, aligning the assessment closely with the intended learning objectives or skills being evaluated. This makes content validity crucial for the development of educational assessments, ensuring that students are evaluated on all relevant knowledge and skills in the subject area.