Thinking along the lines of phrasing, and talking about goals with teachers...

It took me a while to find, but here is a report from 1997, titled What it Means to Teach Gifted Learners Well, by Carol Ann Tomlinson, Ed.D., University of Virginia. This report is on the website of the National Association for Gifted Children (NAGC).

Unfortunately, it appears that much of what was known 20 years ago has been forgotten or pushed aside with the introduction of common core and the focus on creating equal outcomes for all students.