Can you please provide the pros and cons of The Opinion method?

Hello everyone! My assignment is due next Monday and I haven't got a clue how to solve it. Determine the advantages and disadvantages of the Opinion Method.
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"Advantages: It measures people’s abilities to provide news and advice and influence purchase decisions in controlled environments. Disadvantages: It is time consuming as it requires setting up of experimental designs. Itis a complex process and requires subject experts and trained psychologists. Source:"
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A view or judgment formed about something, not necessarily based on fact or knowledge.
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