S. Moges Demonstration, improved Tef varieties, yield 43-49 8(2) 2024 April 2024 Tef is the most important cereal crop in Ethiopia, with the largest acreage among cereal crops. A research study was conducted in Oda Bultum and Chiro Districts to introduce new varieties and a new production system. A participatory breeding approach was used in the present study by involving farmers in selecting varieties suitable for their conditions and environments. The study was carried out in six villages in the Oromia Regionand#39;s Chiro and Oda Bultum districts, purposefully selected due to the high number of Tef-producing farmers in these areas. The varieties used were Bishoftu, Ebba, Dagim, and a local variety taken from respective farmers. Simple statistical tools such as average and percent were used to calculate the technology gap, extension gap, and technology index of tef. ANOVA was used to analyze the data. The results of the study showed that the demonstration had a positive effect on enhancing the yield of tef in the study area. The Dagim, Ebba, and Bishoftu plots showed a significant increase in productivity, with average increases of 26.7%, 22.9%, and 55.9% over the district yield, respectively. The ANOVA results also revealed that there was a statistically significant interaction between the use of improved varieties and the yield of tef (F (1, 28) = 7.79, P =0.0094). Furthermore, using improved varieties had statistically significant effects on yield. The study concluded that effective extension interventions for demonstrating the potential of tef varieties in farmersand#39; fields.