The effectiveness of an organisation can be defined as how well it performs its activities to attain the pre determined objectives. In this present context of agriculture where public, private and collaborated public-private organisation are working in India, it is necessary to study how effective they are in there respective goals. As in general a private extension agencies delivers inputs and some others provides advisory services in addition to formers. The present study was conducted in the private extension organisation, Tata Kisan Sansar (TKS) in Aligarh district of Uttar Pradesh. An ex-post facto research design was used for this study. The data was collected from 50 Tata Kisan Sansar member farmers. The effectiveness of the private organization in technology advisory and delivery services was measured by effectiveness index developed for this purpose. The study revealed that the extension services rendered by Tata Kisan Sansar were found to be medium in effectiveness by majority of the farmers (54 per cent). About 46 per cent of farmers found the extension service is highly effective. The extension services rendered by Tata Kisan Sansar were found to be medium in effectiveness by majority of the farmers (54 per cent) and 46 per cent of farmers found the extension service to be high in effectiveness. The Tata Kisan Sansar, the private initiative provides inputs, services, which is better in accessibility, quality and timeliness to the farmers. The constant advisory support in addition leads to better adoption of technologies which further leads to increase in yield and income and ultimately satisfaction of the farmers

Keyword: Effectiveness; Tata Kisan