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An assertiveness measure was developed based on the Mind Tools framework for fostering assertive behaviour (‘How to be Assertive,’ n.d.). Previous research supports the elements within the Mind Tools framework, but none has been conducted on Mind Tools specifically. Therefore, the purpose of this study is to first verify the construct, and then test the questionnaire based on that framework for its psychometric properties as well as norm the measure. Questions developed ranged from passive in nature to aggressive with varying informants. The construct was validated through a Principle Components Analysis. The measure was normed using pilot testing and a think aloud protocol and found to be reliable and valid.


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