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Formal testing might entail building a usability testing lab, equipping it with an array of computers, audio-video equipment, then staffing it with psychologists, technicians, and human-computer interaction specialists
In general, Usability is difficult to evaluate and measure (Web sites may be the exception)
Usability often may not explicitly be identified as part of the user requirements, nor form part of a product specification.
Even when usability has been identified as a desirable property, it may not be practical for a product developer with the responsibility for developing a product to specification, on time and within budget to justify spending the extra resources required to produce a usable product