The aim of study is to determinate the difficulties of teachers in preparation and implementation of performance task. This study was carried out with 25 teachers (5 science and technology, 5 primary, 5 mathematic, 5 social science and 5 Turkish teachers) who working at elementary schools in Artvin. Sample of study is selected randomly. Case study research method was used in the study. Data gathered with interview, observation and documentary data collection tolls. Obtained data were analyzed with content analyses method. At the end of the study, it is ascertained that teachers do not determine appropriate topics for students' level and appropriate criteria for topics and have insufficient knowledge about how prepared rubrics. Besides, it is seen that teachers encounter some difficulties such as crowded classroom, insufficient time for assessment, insufficient learning environment and technological opportunity and they do not do objective assessment.