This paper describes the comprehensive curriculum and school infrastructure of Information Technology-education (IT-education). The importance of IT-education was already acknowledged in 1987 renewal of the official course of study at school. The nationwide school curriculum at that time was "distributive one", and each subject involved an allocation of curriculum unit handling "IT-education". It is called "Cross Curriculum". However, it is noteworthy that "Informatics based thinking/viewpoints" and "system science based thinking/viewpoints" are not applied in school subjects in the course of study at school. It is necessary to set IT-education as "Informatics for all". Moreover, there is an urgent necessity of making traditional subjects and this new education united as "comprehensive curriculum". JSET (Joint Society of Educational Technology) research-working group on developing curriculum of IT-education (chairperson : T. Okamoto) suggests a new plan of school course of study, compiling requirements, significance, and demands concerning IT-education, which is becoming increasingly important in highly technological society. The contents of the report are summarized in this paper. On drafting this report, we tried to investigate and discuss what kind of rationale for IT-education is essential to construct its curriculum. As the result of it, we proposed the well-balanced and integrated curriculum among knowledge and literacy on Information Technology, knowledge on each existential subject and thinking skills based on System Science.