Background: The level of acceptance of advanced agricultural technology in the innovation diffusion process, is the most important element for encouraging a gain in agricultural production. Methods: The goal of the current study was to compare the yield disparities between the farmers’ practices and the improved package of practices of rapeseed mustard under cluster front line demonstrations (CFLD) on mustard crop by Krishi Vigyan Kendra, Hisar during the year 2018-2019. These 100 demonstrations were carried out in three clusters of farmer’s fields and adherence to recommended practices for mustard production was ensured by KVK scientists. Result: The results revealed that the yield of mustard grown in demonstration plots (2538 kg ha-1) was much higher than that of check plots (2006 kg ha-1). Overall, the output of demonstration plots was 26.49% higher than that of check plots. The 531 kg ha-1 average extension gap brought attention to the need for farmers to receive education through a range of extension approaches in order for them to adopt improved agricultural technology. An average technology index was 11.2% across three clusters. The economic feasibility of the intervention was shown by a good B: C ratio which was 1.65 for farmer’s practice and 2.05 for demonstration plots. The aforementioned information suggests that mustard crop productivity may be increased through cluster demonstrations, which encourage farmers to use the types of scientific production methods that were on exhibit in the CFLD plots.