PBL stands for Problem-Based Learning where primary students learn from real-world problems rather than simply learning facts and concepts. 

How does problem-based learning impact students?

1. Promote the development of critical thinking and problem-solving abilities

2. Communication skills

3. Collaborative skills

4. Finding and evaluating research materials

(Duch et al, 2001)

References: 

Duch, B. J., Groh, S. E, & Allen, D. E. (Eds.). (2001). The power of problem-based learning. Sterling, VA: Stylus.