Public project abandonment remains one of the most persistent obstacles to sustainable development in oil-producing regions of Nigeria, yet much of the existing literature treats successive government transition as an undifferentiated cause of discontinuity without decomposing the specific political, economic, and institutional mechanisms through which abandonment occurs. This study addressed that gap by examining the joint and relative contribution of political, economic, and institutional factors to the discontinuity of Niger Delta Development Commission (NDDC) projects across administrations in Ondo State, Nigeria. A descriptive correlational survey design was adopted, and data were obtained from 360 respondents drawn from NDDC beneficiary communities through a multistage sampling procedure. A three-step hierarchical multiple regression analysis was employed to test the combined and incremental predictive power of the three factor domains. The results showed that political factors accounted for 39 percent of the variance in project discontinuity, economic factors added a further 19 percent, and institutional factors contributed an additional 8 percent, with the full model explaining 64 percent of the variance, F(15, 344) = 43.60, p < .05. Political favoritism and campaign manifesto fulfilment emerged as the strongest individual predictors. The findings are interpreted through institutional theory and public choice theory, and the paper concludes with policy recommendations for insulating public projects from the incentives that drive politically motivated discontinuation.