In cases where a mediator is unfamiliar with your business niche, product or service, the aid of an expert may be needed to educate the mediator.

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Othman believed the second software to be such an off-the-shelf product because of its amateurish construction, but the California expert disagrees.

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Bob Feeney, an expert in product design who carried out the research, said the independence of disabled people was threatened by problems with everyday products.

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