When I first started to give the WIAT, I prepared my reports and discussed my results in collaboration with a school psychologist, so this random score-inputter lady may not be random at all!
Sadly, most of the time that public schools give the WISC and WIAT, they are looking for a Specific Learning Disability and a possible Special Education eligibility. Most students have some kind of pattern of strengths and weaknesses, but a 1.5 standard deviation gap (significant difference) between cognitive and achievement in a specific area often indicates a learning disability. We can't make a decision on SpEd based on that one difference, though. If we did see that kind of difference in the results, we would know that we needed to ask the question, "Does this student have a learning disability?"
The answer in that situation (as far as the law is concerned) comes after the whole team has examined the evidence, the experts (including the parents) have had their say, and questions have been asked and answered. In most cases, the team reaches a consensus. If the team does not agree, there are many possible next steps.
Sadly, pathetically, I have never been involved in a meeting where these scores were used to determine if someone is gifted. I have some students in my classes that have been sort of informally identified as gifted, but none of them have actually been assessed as far as I know.
{sigh}
