Some Assumptions about Psychological Testing and Assessment: Assumption 1: Psychological Traits and States Exist Trait: Any distinguishable , relatively enduring way in which one individual varies from another (specific intellectual abilities, cognitive style, interests, attitudes, sexual orientation) Psychological Traits exist as a construct- an informed scientific concept developed or constructed to describe or explain behavior. We can't see, hear or touch constructs but we can infer their existence from overt behavior States: also distinguish one person from another but less enduring Assumption 2: Psychological Traits and States Can Be Quantified and Measured Traits and States need to be carefully defined Consider the type of item content that would provide insight into it Measuring traits and states by means of a test entails developing not only appropriate test items but also appropriate ways to score the test and interpret the results Assumption 3: Test Related Behavi...