What does it mean to say that a student (or group of students) has gained a year of learning, half a year of learning, whatever?
When we use a standardized test as the basis for such statements, what kind of raw scores are we talking about? Even the Woodcock-Johnson Tests of Acheivement (3 ed), used with my students with disabilities and individually administered, sometimes makes me wonder.
So, what if we were talking about a generic test 40 questions long? How do you use that to gauge the amount of learning that has occurred?
TFA says you can claim a year of growth based on answering 3 more questions correctly compared to a control group... http://garyrubinstein.teachforus.org/2013/03/09/is-a-half-year-of-learning-equivalent-to-one-question-on-a-multiple-choice-test/
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