The document discusses several studies that examine the use of open-ended problems and problem-based learning in mathematics education. It describes how open-ended problems that allow for multiple solutions can improve students' divergent thinking skills compared to multiple choice or algorithm-based questions. Several studies found that problem-based learning approaches enhanced students' self-confidence, organization, attention, and willingness to participate when compared to traditional expository teaching methods. However, the document also notes some challenges in implementing problem-based learning, including the need for regular use and connection to multiple disciplines.