ABSTRACT
The validity of an assessment instrument is an indication of how well the scores derived actually measure the variables they are intended to measure. The scores should be interpreted with supporting theory and evidence that what is purported to be measured is actually being measured. Convergent validity examines the relationship between the SIGS-2 and other tests that purport to measure the same constructs. Discriminant validity examines the relationship between the SIGS-2 and other tests that measure different constructs. Construct validity is supported when the evidence indicates that the scale behaves in a way consistent with theory. Investigating model fit is a global endeavor, and attention should be paid to several statistics. The SIGS-2 Social Studies scale measures the frequency of behaviors associated with advanced social studies abilities.
