A style of active learning PBL refers to learning opportunities that use real-world issues or problems to increase knowledge and understanding.
Students work together in small groups typically facilitated by teachers. PBL is a student-centred approach and at each step of the learning process the students must decide what they know or can do already and what they need to know or learn how to do in order to continue. They then have to find that knowledge or learn a skill and incorporate this into their developing framework of understanding and competency.