Reliability - How exact is the test? (Psychology) - Part 2

Reliability is one of the most important quality aspects of measurement instruments. It can be fatal if measurement instruments are not reliable.
But how can you determine the reliability of a psychological test or
questionnaire?

To estimate reliability several methods can be used which
have pros and cons:

a) test-retest reliability method
b) parallel-forms method
c) split-half method
d) internal consistency

Author: Eskil Burck (Degreed Psychologist)

www.learningpsychology.net