Many U.S. educators now wonder whether they're teachers or targets. This mentality stems from the specter of their school being sanctioned for failing the state accountability tests mandated under No Child Left Behind (NCLB). According to this author, most of those tests are like blunt-edged swords: They function badly in two directions. While many teachers complain that their schools are actually better than their students' low test scores indicate, it is rare to hear teachers argue that their students' high test scores may actually be masking wretched instruction. He contends that inaccurate judgments about school quality can harm students, whether those evaluations are negative or positive, and that attention must be paid to both kinds of evaluative mistakes.