Interrater reliability (also called interobserver reliability) measures the degree of agreement between different people observing or assessing the same thing. Remember that changes or recall bias can be expected to occur in the participants over time, and take these into account.When planning your methods of data collection, try to minimize the influence of external factors, and make sure all samples are tested under the same conditions.When designing tests or questionnaires, try to formulate questions, statements, and tasks in a way that won’t be influenced by the mood or concentration of participants.You devise a questionnaire to measure the IQ of a group of participants (a property that is unlikely to change significantly over time).You administer the test two months apart to the same group of people, but the results are significantly different, so the test-retest reliability of the IQ questionnaire is low.
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