PBL is different from conventional forms of learning in chemistry in that the students work in teams throughout the process and move towards a solution to the problem scenario together by gathering and sharing information and ideas. There are several formal models of PBL and these are strictly adhered to in some disciplines, particularly medicine and associated professional disciplines, such as nursing (Boud and Feletti, 1998). As PBL is relatively new in the sciences, practitioners are developing flexible models and implementing them in ways that suit their own particular context. However, the common features of a PBL pedagogy are the use of a real world context for the problem scenario, group work, complex problemsolving,the acquisition of newknowledge, andassessment through the presentation of outcomes or product. However, the problemscenariosusedinPBLareusuallystatic;thatis,theproblem thatstudentsproduceasolutionforisthesameastheonethatthey were first presented with.