The main purpose of this study was to investigate the opportunities that have promoted the use ofrnHadiyyisa as a medium of instruction, the challenges thet were faced in due course of its implementationrnand the successes that have been gained as a result of the implementation of Hadiyyisa in the primaryrnshools of Hadiyya Zone for instructional purpose.rnTo this end, a descriptive survy method was employed to collect and analyze data. Mainly, concurrentrnnested approach was followed during the collection and analysise of data. Accordingly, sampling wasrncarried out through both random and purposive sampling techniques. Thus, nine sampled schools werernselected from Soro, Misha and Misrak-Badawacho woredas of Hadiyya Zone. The subjects of this studyrnwere 30 teachers, 170 students, 10 educational officials and 16 parents. Data were gathered throughrnquetionnaires, interview and observation.rnThe research result indicates that relatively stimulated community attitude and psychological readiness tornuse mother tongue, Enthsiastic feelings of Hadiyya intellectuals, positive support of local PoliticalrnAuthorities, experience gainedfrom the Literacy Campaign and National Language Policy as some of thernopportunities that have induced the use of Hadiyyisafor instructional purposes.rnOn the other hand, scarce instructional materials, insufficiently simplified translation of teachingrnmaterials, insuffiCient training to develop skills of instructional language and insuffiCient participationrnof teachers in preparation and evaluation of the instructional materials were some of the challenges thatrnwere identified by the study. Moreover, this study also had identified successes in that relatively increasedrnstudents enrollement, decreased dropouts and repetions rates as were successes. Besides this, researchrnresult also indicated those most likely improved students' selj-estt~m and selj-expression, motivatedrnclassroom activities, preparation of subject dictionary in the vernacular language and giving educationrnsupported by radio transimition in Hadiyyisa and some others as successes gained because of the use ofrnHadiyyisffor instructional purposes though researcher believes that many other factors would alsorncontribute to this result.