There may be more ridiculous ways to measure education than “days of learning,” but this bogus measure remains popular, particularly among charter cheerleaders.
CREDO studies often attribute, say, an extra 26 days of reading to charter programs. What the heck does that even mean? Which 26 days would that be? 26 days in September, because noticeably less learning gets done in that first month of school. Is it 26 Wednesdays? Mondays? Fridays? Because each of those days looks a little different in my classroom. And is that a day of First Grade or Tenth Grade? Is that a day for some sort of standardized student, or an average student? Do we correct for distractions, like a day on which a student is upset about some problem at home? How do we arrive at that metric for a single day– take the gains that somebody somewhere says students are supposed to make from one year’s test to the next and divide it by 180? Because, of course, there are some days on which no learning takes place at all (for instance, the days we spend taking that Big Standardized Test). Can we keep breaking this down– can I talk about hours of learning or minutes of learning? Seconds of learning?
Most importantly, has anybody ever provided any validation of this kind of measure at all?