Semantic-Pragmatic Disorder

My supervisor spoke to me about the possibility of my case having some semantic-pragmatic difficulties. He had difficulties understanding my instructions and questions, and was not able to follow instructions despite explanations and demonstrations. Furthermore, despite being almost 13yo, he had difficulties using simple words such as "cage" and "tank" to add on to his story of his pets. His verbal ability was definitely very low, and at the same time, he seemed to not be able to respond appropriately to the situation (such as instructing him to do something quickly).

Anyway, I checked it up, and found some sites that described semantic-pragmatic disorder. It is closely linked to autism, often described as high-functioning autism, but I think, not to be mistaken for asperger's syndrome.
What is Semantic-pragmatic Disorder?
- my child performed significantly better on the non-verbal reasoning as opposed to verbal

Semantic Pragmatic Disorder
This was written by the mother of a child with semantic pragmatic disorder. I liked how she put the description of how a child with this disorder takes language literally by asking the reader how this child might respond to the idiom "raining cats and dogs"! :)