Psychometrics is concerned with minimising bias and error in the measurement of individual differences. This encourages the explicit definition of what we mean when we discuss differences between people (intelligent, emotional, outgoing etc).
While objectivity is a worthy goal the measurement of individual difference remains complex and psychometric assessments are too often promoted as if they were absolute measures. This often leads to an over-reliance on a narrow psychometric construction of individual difference.
My personal view on assessment tools is that it’s most important to use a tool that you understand thoroughly so you can listen for coaching opportunities. Coaching is first and foremost a conversation so it’s important not to get bogged down in the mechanics of an assessment.
When I was a speech pathologist, there were several tools that could evaluate aphasia. They were all effective but I was most comfortable with the BDAE. I found that when I had to use an unfamiliar instrument, my capacity to connect with the client was compromised. I have found that to be true in my new profession, coaching. Pick what you understand most so you can truly connect.
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