Of recent, there is changing work environment for agricultural extension workers as they operate under the multi-stakeholders’ phenomenon. This increasingly poses a challenge to frontline extension workers trained on linear model (extension-researcher-farmer linkage) in extension services delivery. This is because, facilitating the multi-stakeholder processes requires competent agricultural extension workers well-versed in human relations. In recognizing the importance of human capital development for agricultural extension service delivery in Tanzania, Sokoine University of Agriculture established a mid-career agricultural extension training programme in 1998. Informed by the human capital theory, this study employed an evaluative study design to assess the impact of the Sokoine University of Agriculture (SUA) mid-career BSc. Agricultural Extension and Education training programme on human capital development. The study was conducted in five agro-ecological zones, that is, Eastern, Western, Central, Southern Highlands and Lake zones in Tanzania. The development of the sampling frame was done in collaboration with the Ministry of Agriculture (MoA), Ministry of Livestock and Fisheries (MLF) and President’s Office-Regional Administration and Local Government (PO-RALG). A total of 200 respondents-100 alumni and 100 farmers were sampled proportionately. A snowball sampling technique was used to replace the respondents who were selected randomly but could not be reached for interview. Data were collected from respondents through a questionnaire that covered a set of competences through analysis of the mid-career agricultural extension curriculum and consultations with public and private employers. In addition, literature review and observations were also used to supplement the collected information. The findings indicate that the agricultural training programme at Sokoine University of Agriculture (SUA) equipped graduates with appropriate knowledge, competencies and skills that improved their job performance and productive capacities that enabled them to interact with various stakeholders and facilitate multi-stakeholders’ processes. This is in line with the purpose of establishing the programme. Hence, this points to the need for continuous human capital building and motivations of agricultural extension workers for the improvement of their performance. Key words: Mid-career, Agricultural extension workers, Curriculum, Human capital, Multi-stakeholder processes