PROJECT -BASED LEARNİNG

Project – based learning was discovered 1990s. PBL is an instructional method that provide pupils’ skills about every dicipline. Active construction , situated learning , social interactions , and cognitive tools are theoretical background of project –based learning . PBL have five key features . There are driving questions, situated inquiry , collaboration , learning technologies , and artifacts. At first , applying Project –based learning methods schools adopted this curriculum . Student performance had scaled pre and post – test . According to tests’ results , pupils had significant learning gains. In addition , students showed that positive views and attitudes about science in this research. If curriculum carefully design with PBL , students will have substantial learning gains. Researchers hope that teachers will use this methods. But most teachers think that this method take long time and they have any appropriate materials for PBL. If teachers are provide about  PBL methods by researchers , they will improve themselves and help to develop PBL and materials. My question ;

Every individual have different solution about driving question . Answers may be correct or wrong. In this instance , how could teachers control in crowded classrooms ?

How can we do assessment in PBL? Are important groups or individuals evaluated ?

Does not occur in a competitive environment in classroom ? Doesn’t be reflect harmful efects of this  in learning environments ?