Answer:
Inter-rater reliability
Step-by-step 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.