The main objective of this research was to investigate the role of CEE in the development ofrnStudents' behavior at Kokebe Tsibah secondary and preparatory school. To realize this purpose,rncase study method was implemented. Data were gathered from the school vice principal, 8rnteachers, two education experts and two parents. Sixteen students were participated in focusrngroup discussion (FGD). CEE textbooks for Grade 9 and 12 and other documents were alsornreviewed in order to see the place of Ethical and moral issues in the textbooks. Other schoolrndocuments like attendance sheets, exam records and other activities of the school and thernstudents were also viewed. Classroom observation was also conducted so as to understand thernextent to which CEE teachers and others give room for ethical issues during their instruction.rnMoreover, students' conduct inside and outside the classroom was observed formally andrninformally. The participants for the interview and FGD were selected purposely based on theirrnwillingness, responsibi lity, and cooperation, competitiveness (maturity and assertiveness forrnstudents). On the other hand, the new textbooks of CEE for upper secondary and preparatoryrneducation have not incorporated that much variety of ethical issues even though core moralrnvalues li ke respect, truthfulness, loyalty, responsibi lity seem hardly addressed by the textbooksrnof CEE. The coordination of parents and school admini stration is poor. The influence of externalrnenvironment and fami ly'S socio-economic background of the students found to be the greatrnchallenge for the cultivation of the students' ethical behavior. On the basis of this findingsrnawareness creation and ski ll development trai ning fo r teachers should be given. Improvingrnschool-parent relationships, involving stakeholders like the media, the NGOs, well knownrnelderly people for the teach ing of good behavior have to be practiced in creating ethical schoolrnenvironment and the surroundings. And fin ally forward ing for fUliher study on the issue wasrnrecommended