Below is a link to a Forbes article about a recent study published in The Lancet. The study involved a look at an early intervention technique for autism called PACT, which stands for Preschool Autism Communication Trial. The approach essentially trains the parents to recognize communication attempts and cues from their autistic children. The intervention starts at preschool age, goes for about a year, and follows up with the participants around age 10.
While I really like the idea of giving power back to the families (unlike, say, many forms of ABA that leaves power with the professionals), I also see the author’s point of whether or not PACT truly had an effect. There is a lot of data analysis in here, so if you prefer to just get the abridged version, the first few paragraphs of page one and the last few paragraphs of page two will suffice.