The research aimed at developing a participatory development planning model for Sub-district Administrative Organizations in Angthong Province. The research methodology involved a combination of quantitative and qualitative techniques.
	The study was divided into four key stages: 1) the study of conditions and problems of the actual performance of participatory development planning, 2) factors supporting people participation in development planning, 3) synthesis and analysis of the problems and factors in accordance with twenty participatory development planning methods conducted by field experts for a model of development, 4) the experiment of the model implementation in a sub-district for improvement.
             The study of the actual development planning indicated that the sub-district administrative organizations complied with the state procedures and regulations on preceding the participatory development plans.  However, the plans lacked qualitative management, knowledge and information on participatory development plans, vision on community strategic planning, and the integration of community strategic planning in the participatory development planning process.  The factors supporting the participation on the development planning were team learning, communication, the quality of the leaders and networking of people and organization. 
              In the development of a model, the study suggested seven staged procedures which were: 1) preparation, 2) team learning, 3) exploring and data collecting, 4) data analysis, 5) plan 

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drafting, 6) public hearing, submitting and presenting, and 7) assessment and evaluation. To make the planning procedures successful, the seven staged procedures must take an account of the situational contexts of the followings: community problems, the factors supporting the participation, community core leaders, the cooperation of Sub-district Administrative Organizations, supportive organizations, and the village and sub-district official leaders. The communication on the knowledge and principles of the planning procedures needed to pass on to public for understanding and further collaboration.  
             For the model implementation in a sub-district, the results showed that the participants learned and followed the staged procedures accordingly and it produced positive results of team learning and good community development plans with projects giving solutions of community concerned problems.  In conclusion, the participants had knowledge and understanding of community strategic plans, realizing the importance of pertaining, collecting and keeping data for planning operations.   
