These days, he says we teach a lot that isn’t going to matter, in a significant way, in students’ lives. There’s also much we aren’t teaching that would be a better return on investment. As a result, as educators, “we have a somewhat quiet crisis of content,” Perkins writes, “quiet not for utter lack of voices but because other concerns in education tend to muffle them.” These other concerns are what he calls rival learning agendas: information, achievement, and expertise.