Most studies show that students also have more coherent answers.
The development of expertise is characterized by the development of complex hierarchical knowledge . Hypothesis-driven reasoning strategies that are taught in PBL can accelerate the development of this knowledge. Furthermore, the knowledge is probably more accurate and more tightly linked than it would be if students learned the same material in a lecture-based class. Hypothesis-driven group discussion forces students to articulate clearly their knowledge, explanations and theories. As false knowledge is exposed, they can modify it.