The study examines teachers' commitment to the curriculum applied in the classroom and relevant parent opinions. The qualitative case study design was used in the research. The research sample comprises four preschool teachers selected by the contingency sampling and eight parents selected by the criterion sampling. The data were collected through interview and document analysis techniques and analyzed with content analysis. It was found that the devotion of teachers working in private schools to the curriculum is higher than public school teachers. The teachers applied program adaptations within the scope of rearrangement, expansion and omitting patterns. As the adaptation factors are classified under 5 categories as "the influence of school administration, professional experience, the student readiness factors, parent expectation, and teacher interest in the subject. It has been determined that the public school students' parents have more positive opinions about the program followed in the classroom compared to the private school students' parents.