Reliability and Validity

• How is reliability is assessed?

  By the correlation between the scores that people receive on the same measurement on two different occasions. Perfect reliability = 1
• What should the reliability of modern intelligence tests be?

  At least 0.85
• What do you need for high reliability?

  Standardised test procedures and standardised test administration and objective scoring.
• How is the Wechsler Intelligence scale for children and the Stanford Binet intelligence scale been changed ?


  Been adapted to updated to better reflect the abilities of test-takers from diverse cultural and linguistic backgrounds by creating new ways of creating, administering and interpreting tests (to reduce issues)​
• How have issues and bias lead to the development of modernised tests?

   Kaufman’s test which is tailored for individuals ​