Acceleration : Practical Applications and Policy Implications

And therein lies the paradox. When you don't believe in something, you demand nearly perfect evidence. If you are comfortable with an educational intervention, anecdotal evidence is plentiful and sufficient. When it comes to acceleration as an intervention, we do have consistently robust research evidence. However, that is not enough to put acceleration into common practice.—Assouline, Colangelo, and VanTassel-Baska (2015, p. 14)