Abstract
The purposes of this study were to verify the validity of 'Organizational Development Theory for School (ODTS)' and to find a solution to overcome the difficulty of changing school organization. This study was executed based on models and assumptions of ODTS which aimed to enhance ability of spontaneous improvement of school, and this study was executed to develop school organization incrementally from the actual state of the school under study. A small elementary school was subjected to this study. From this study, the basic model of ODTS was verified, and some strategies and methodology for executing organizational development were found. These were described as below. 1) A strategy for incremental developing collaboration in school, 2) A strategy for constructing problems and tasks in school starting from cognition of the actual state of pupils, and 3) A methodology to improve teachers' lesson practice based on shared problems of the school.
