Factors associated with effective job performance among agricultural extension workers in Jamaica were examined; and the validity of transferring, to a developing nation, the descriptive and theoretical generalizations concerning selection of effective extension workers in the United States was investigated. The sample of 99 officers included 30 advisory, 52 development, and 17 Land Authority Extension (LAE). Two interview schedules and the Rokeach Dogmatism scale were used. Multiple correlation coefficients were calculated to determine the predictive value of clusters of variables. Among all three groups, the seven factors rated by superiors (initiative, reliability, emotional balance, communication skill, cooperation, technical skill, and leadership influence) correlated highly and significantly with job performance. With all groups dogmatism and attitude toward farmers were highly negatively correlated. The other findings varied widely between groups. Significant positive correlations with performance among officers were found with the following variables; belief in the cause (advisory officers); self-improvement and self confidence (development officers); and education and self-evaluation (LAE officers). (Author/NL)