I wish I had heard about PRT when Rob was younger. It appears to have some things in common with RDI, which I have discussed elsewhere on this blog. This article says that PRT can help even teenagers:  I wonder about adults? Of course, the idea is to target these areas of brain function while the brain is still developing.

PRT: “A targeted technique meant to improve social engagement among children with autism spectrum disorders, PRT forgoes the focus on specific skills, like block-building, to concentrate instead on so-called “pivotal areas,” such as motivation, in hopes of inducing a cascading effect with similar impact across multiple areas.”