Today we looking at the goals of the training programs, we are faced with a set of skills called  the 21st Century skills. This skills are critically important to success in today’s world. One of the these skills is to solve the problem and one of the best practices for implementing 21st Century Skills is Problem-Based Learning. However, types of problems referred to here is non-routine problem. In this study problem-solving skills of the teachers were investigated. For this purpose, total 56 prospective science teachers studying in Uludağ University have been included in study.

Students were given two different non- routin science problems. The first of the problem has two variables, and the second has three variables. Evaluation were made according to Polya’s first two steps. Students were asked to write clearly, what understand the problem and what should be done in order to solution. The data gathered from students were coded and interpreted using descriptive analysis.   The findings showed that, they were partially successful to solve two-variables problem but, they failed to solve the three variables problem.

Key words: non routin problem, problem solving skills, prospective science teachers,