Alternatives: portfolios and performance tasks

What if we stopped grading students? This is no longer a hypothetical question. From primary schools in China to university classrooms in the United States, educators and policymakers are running a bold experiment. They are removing exams from the center of education to see what happens. If we change how we measure performance, will the real experience of learning finally improve? On the show: Niu Honglin, Steve & Yushan