My study needs evaluation of aggressive behaviour in preschool children. For the purpose I want to use Overta Aggression Scale/Modified Overt Aggression Scale in my study. Could you please advise me on certain points........

Is OAS/Moas copyright by anyone?

If yes then what are the charges for research use?

How much time does it take in a single evaluation?

Can I can use OAS/MOAS? I am preschool teacher

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