This book examines the economic performance of dairy co-operative in java during the 1980-1996 periods. In fact, no wide-ranging or in-depth research on dairy co-operatives as economic organizations has been conducted, nor has an analysis of time series been undertaken in terms of profitability, productivity and technical efficiency of co-operatives. This book proposes to fill that gap by focusing on the profitability, productivity and technical efficiency of the five co-operatives. Using financial analysis, the profitability of the five co-operative was low, meanwhile, using analysis of New Institutional Economics shows that transaction and organization cost were significant in reducing profit in the five co-operative. Using Tornqvist index number and the stochastic production frontier as tools for analysis, the productivity and technical efficiency in all co-operatives were not low. This was because Indonesian government imposed Proportional Import Ratio Policy which protected dairy co-operative during 1980-1996 periods. This book is useful for people involved in co-operative movement, researcher and lecturer, practitioners and students at the university.