The purpose of this study is to analyze cases of the use of school organizational technology at Haneul High School based on four types of organizational technology proposed by Perrow: daily technology, artisan technology, engineering technology, and non-routine technology. According to the school management policy based on the principal's educational philosophy, Haneul High School used school organizational technology for each type of organizational technology proposed by Perrow to improve the quality of teaching and learning centered on the student career-selective curriculum.
 The results of the case analysis on the use of Haneul High School's school organizational technology are as follows. The first is the use of routine technology. 1) The classroom tour, 2) the sound of bells during class, and 3) the operation of the Morning Spark program were organized into regular routines. The second is the use of craft technology. 1) Starting with the perception of the class, 2) the class consulting system, 3) the class survey and awards for class reflection, 4) the principal and the staff for curriculum reflection, and 5) the Teacher's Research Forum (TRF) for educational reflection were continuously operated. Third, it is the use of engineering technology. 1) (Standard) The Diploma system (graduation certificate) was operated as a certified engineering technology area, 2) the CNSA-net operation as an information engineering technology area, and 3) the curriculum-friendly school space was designed as an architectural engineering technology area. Fourth, it is a nonroutine technology. For the smooth operation of the school organization structure, the "consultation system for communication and decision-making" was operated. As such, school organizations need to reasonably utilize school organizational technology based on the types of organizational technology (routine technology, craft technology, engineering technology, and nonroutine technology) according to the characteristics of the task.