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Scenario $13\mathrm{.}2.$

Tareq owns his own small firm. The firm has expanded significantly and is thinking about putting some ads on television. Tareq has decided it is time to get a lawyer to advise the firm on business issues and ensure that its activities obey all relevant laws. Tareq meets with a lawyer on a recommendation from a friend. The lawyer seems to have great credentials, and the advice they gave Tareq seems solid. But the lawyer's advice comes at a high expense. Tareq wants to make sure he gets the best service possible for the price he is paying. However, he does not have much experience with the law and does not know how to measure the lawyer's services based on quality. It is particularly hard for Tareq because the advice he gets from the lawyer is something he cannot see, making it much harder to measure according to quality characteristics. He looks online at the reviews of other consumers who used the lawyer's services.

Refer to Scenario $13\mathrm{.}2.$ Based on the scenario, what characteristic of services has made it difficult for Tareq to analyze service quality?