The main purpose of this study was to assess and analyze challenges, opportunities and implementing of effective education critical mass organization for cooperative learning at Debremarkos College of teacher education. To achieve this objective a descriptive survey method was employed. The data for the study were collected by quantitative and qualitative methods. Open ended and closed ended questionnaires were distributed and collected back (199 students and 30 college teachers). FGD were also

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... employed with five academic commission members. The data collected with the above listed data collection instruments were analyzed by using both qualitative and quantitative method of data analysis. Due to the nature of data collected from the participants, frequency, percentage, mean, one way ANOVA, one sample T-test and post hock were used for analyzing the collected data.FGD and open ended questionnaire data were analyzed qualitatively like narration interpretation and direct citation. After analyzing the collected data, the main challenges for organizing and implementing effective education critical mass were negative attitude of teachers and students towards the program, students belief of the task is belongs to only teachers, no guide line for the implementation, class size and lack of time were the main challenges. Some opportunities like having experienced advisor, the college write a formal letter for the assigned advisor and having enough space at the college were best opportunities. The level of implementation at the college was at grass root level but there were significant difference between departments, student understanding and students' attitude towards the program. Finally, based on the conclusion driven from collected and analyzed data recommendations were forwarded to different stakeholders who are directly or indirectly participate in the program like students, teachers, regional education bureau, college administrative bodies and academic commission were taken lion share recommendations.