Stage 1: identify issues to research, find the research questions, conduct research overview, from which to build the theoretical framework for the study.Stage 2: identify the data collection including secondary data was collected from State agencies such as the Bureau of statistics, the Department of agriculture and rural development, .... Primary data is determined the content includes such as: amount and choose the form of observation, location, method of data collection. From there proceed to construct the questionnaire survey, conducted a pilot survey, then proceed to adjust the questionnaire accordingly with the practices and conduct mass data collection.Phase 3: data processing, conducting production function estimates black pepper by the method of the average variance of children (OLS-Ordinary Least Square), statistical significance testing and inspection the defects of the model.Phase 4: technical User Lagrance to build production function with binding conditions on the costs to determine the maximum output level, functional building profits with binding conditions on the costs to determine the level of maximum profit. Applications of network models (Bayesian Belief Networks-BBNs) conducted the simulation of the change of the yield black pepper when changing the amount of use of inputs in the production of black pepper.Stage 5: general implementation, discussions aimed at bringing out the solutions aimed at improving the efficiency of production of black pepper on the province of Dong Nai.
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