The purpose of the research is to describe the problems in the program evaluation field according to curriculum's four different dimensions, to search if the problems differ significantly according to students' class level and teachers', administrators'/inspectors' seniority. The research used one of the quantitative research methods, the field survey model, which is descriptive research. The population of the research is Samsun city, and the target population of the research is middle-school students, teachers of Turkish and English branches, inspectors and administrators working at secondary schools in Samsun city's districts Atakum, Bafra, Canik and Ilkadim. The research sample consists of middle-school students, teachers of Turkish and English branches, inspectors and administrators working at middle-schools in these districts, chosen with stratified sampling, a random sampling method. In the research, "Survey of Defining Problems about Curriculum Dimensions" is completed by the students, teachers and inspectors/administrators. When the participants' problems about the curriculum dimensions are examined, it is revealed that the most common problems they face is the lack of adequacy of functionality, flexibility, practicality, scientificness and actuality of the dimensions of curriculum. It is concluded that students' issues with program evaluation differ according to their class levels whereas the inspectors'/administrators' problems with program evaluation do not differ significantly according to their seniority.