A study of the impact of project-based learning on student learning effects:

The conclusion of this study reads in part:

This study conducted a meta-analysis of 66 empirical research papers on the use of project-based learning interventions for learning, and the findings provide evidence for the use of project-based learning in education to develop students’ core literacy and higher-order thinking skills, and 21st-century skills. The results show that: (1) project-based learning can significantly improve students’ learning outcomes compared with traditional teaching models; (2) the effects of project-based teaching are influenced by different moderating variables, including subject area, course type, academic period, group size, class size, and experiment period.

If you are interested, you can read the complete study: A study of the impact of project-based learning on student learning effects