Suppose your measure of interpersonal aggressiveness involves having trained observers watch the person being assessed in a variety of situations that might be expected to elicit interpersonal aggression. You would want to make sure that you assessment yielded similar results regardless of which observer completed the ratings. That is, you would want to ensure your instrument had acceptable reliability.

Inter-rater reliability

Explanation:

Inter-rater reliability also called inter rater concordance or inter rater observer reliability measures the level of consistence of observers. In other words it measures how reliable observers are by comparing and measuring the level of agreement of the ratings of the different observers. In the example in the question you would use inter-rater reliability to measure how much the ratings of the observers of interpersonal aggressiveness agree and are therefore reliable.

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