Do you think the measure has good reliability-What about validity? How would we, as psychologists, go about assessing the reliability-validity of the self-esteem scale?

Psychological Measurement: Defining and Measuring Variables

Evaluating Reliability and Validity. Complete the Rosenberg Self-Esteem Scale and compute your overall score. You don’t need to post your score,discuss how well you feel that measure describes your own sense of self-esteem and why. Do you think the measure has good reliability? What about validity? How would we, as psychologists, go about assessing the reliability and validity of the self-esteem scale?

https://wwnorton.com/college/psych/psychsci/media/rosenberg.htm