This book is dedicated to all readers who are interested in broadening their understanding of the performance of the Sunflower oilseeds sector in Tanzania and the world. It therefore, provides useful references for further research in the Sunflower value chain. The book is adopted from the Research paper that was presented at the Institute of Social Studies of Erasmus University of Rotterdam, Netherlands in 2015. Besides, it is a potential development tool for the policy and decision makers as well as all stakeholders within the sector. The Paper attempted to assess the performance gap between farmer's oilseeds processing cooperatives and private processing enterprises within the sunflower value chain in Tanzania. In this study, both secondary and primary survey data from Singida Region are employed and descriptively analyzed with the help of a computer program known as Statistical Package for Social Science (SPSS). The results indicate that, there is a negative performance gap which is observed in two dimensions within the study namely by; the identification of key performance factors and a perverse. I hope you will find it useful and professional tool in your reading career.