Excellent article from October 2015.
EXCERPT:
This kind of anxiety and frustration can be largely avoided, said Wolf, who is also director of the Center for Reading and Language Research at Tufts University and author of “Proust and the Squid: The Story and Science of the Reading Brain.” She and colleague Martha Denckla designed a simple test to quickly know whether there is a problem in the reading circuit very early on, as early as kindergarten or first grade. Called the RAN/RAS test (Rapid Automatized Naming/Rapid Alternating Stimulus), students are timed on how fast they can name letters, numbers, colors and objects.
RAN/RAS or a comparable evaluation is one of the single best predictors that there’s something different in how the brain is putting together letters with their name, which is like a mini-version of the later reading circuit. While RAN/RAS cannot diagnose a reading problem, it does provide educators with a red flag, suggesting that students may need further evaluation.