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Intelligent tutoring systems (ITSs) have been proven effective in supporting students' learning activities, but the actual utilization of ITSs has not been confirmed. Delegation of development tasks from developers to teachers through the use of ITS authoring tools (ITSATs) is not promoting rapid progress in this area of research. Designing ITSs using ITSATs by teachers seems to be difficult to realize. This could be affected by insufficient features in ITASTs which meet teachers' requirements. This paper presents feature analysis of ITSATs. In this study, we examined two categories of features: authoring environment and lesson content creation. The study focuses on three ITSAT namely CTAT, ASPIRE and Assistment Buider. We investigated the availability of such features in those ITSAT and propose ITSAT features which could meet teachers' requirements in using ITSAT to design ITS.