I read another claim about programs that make "significant impact on student achievement."
I'll presume positive impact, but the bigger question is 'achievement of what?' I'm not being sassy here. If achievement of higher test scores, that's somewhat immaterial to whether the student is getting a good education. If it's achievement of self-esteem, I need to see the data that shows such achievement is 'best practice.' If something else, please specify.
The What Works Clearinghouse says it is a "trusted source of scientific evidence of what works in education."
Similar question--what works...for?
I don't remember who it was I read that observed that every discipline or profession needs its specialized language, in part to reserve participation in the conversation to the initiates only. If this is any indication, then the least specialized groups seem to come up with the most awkward language of all.