The word "rigor" is hard to avoid today, and it provokes strong reactions from educators. Policymakers tout its importance. Publishers promote it as a feature of their materials. But some teachers share the view of Joanne Yatvin, past president of the National Council for Teachers of English. To them, rigor simply means more work, harder books, and longer school days. "None of these things is what I want for students at any level," Yatvin says. Part of the problem is that we have adopted the jargon without a clear understanding of what we really mean.