This study examined the livelihood impact of Good Agronomic Practices (GAP) on cassava output and income among cooperative farmers in the Adani Omor Zone ATASP-1. Data was collected from a random sampling of 317 cassava farmers. The analytical tools used include the mean threshold from a five-point Likert scale and propensity score matching (PSM). The study revealed that several GAP components remained at the trial stage, evidenced by a grand mean of 4. Timely planting (90. 5% adoption; mean = 5), organic manure application (90. 5% adoption; mean = 5), and timely harvesting (72. 2% adoption; mean = 5) were completely implemented. According to logistic regression analysis, adoption probability fell with age (odds ratio = 0. 974) but rose with credit access (odds ratio = 1. 969), agricultural experience (odds ratio = 1. 026), and education (odds ratio = 1. 060). The treatment effect improved balance and lowered the normalized distance from 0.581 to 0.035. Which includes control variables in impact analyses, showed that using certain techniques boosted cassava yield by around 5.15 units (t = 2.74**) and farm revenue by roughly ₦136,261 (t = 2.17**). The findings showed that although using GAP produces major increases in production and income, livelihoods are limited by the absence of a consistent change from testing to sustained adoption—particularly for capital-intensive and technologically sophisticated innovations. The study therefore recommends that ATASP-1 coordinators should strengthen credit access, extension depth, and input delivery systems to help translate technology dissemination into sustained livelihood improvement.