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One notable early finding, Ms. Phillips said, is that teachers who incessantly drill their students to prepare for standardized tests tend to have lower value-added learning gains than those who simply work their way methodically through the key concepts of literacy and mathematics. Teachers whose students agreed with the statement, “We spend a lot of time in this class practicing for the state test,” tended to make smaller gains on those exams than other teachers. “Teaching to the test makes your students do worse on the tests,” Ms. Phillips said. “It turns out all that ‘drill and kill’ isn’t helpful.”

We all may read books the way we increasingly read magazines and newspapers: a little bit here, a little bit there.

People tweet and text one another during plays and movies, forming judgments before seeing the arc of the entire work.

Recent books by respected authors like Malcolm Gladwell (“Outliers”), Susan Faludi (“The Terror Dream”) and Jane Jacobs (“Dark Age Ahead”) rely far more heavily on cherry-picked anecdotes — instead of broader-based evidence and assiduous analysis — than the books that first established their reputations. And online research enables scholars to power-search for nuggets of information that might support their theses, saving them the time of wading through stacks of material that might prove marginal but that might have also prompted them to reconsider or refine their original thinking.

So a few years ago, I started slipping my classes short writing assignments alongside the required papers. Once, I asked them, “Come up with two lines of copy to sell something you’re wearing now on eBay.” The mix of commerce and fashion stirred interest, and despite having 30 students in each class, I could give everyone serious individual attention. For another project, I asked them to describe the essence of the chalkboard in one or two sentences. One student wrote, “A chalkboard is a lot like memory: often jumbled, unorganized and sloppy. Even after it’s erased, there are traces of everything that’s been written on it.”

My ideal composition class would include assignments like “Write coherent and original comments for five YouTube videos, quickly telling us why surprised kittens or unconventional wedding dances resonate with millions,” and “Write Amazon reviews, including a bit of summary, insight and analysis, for three canonical works we read this semester (points off for gratuitous modern argot and emoticons).”

And short isn’t necessarily a shortcut. When you have only a sentence or two, there’s nowhere to hide.