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Traditionally, intelligent tutoring systems (ITS) are dedicated to learners. They help them learn at their own pace, following a curriculum tailored to their individual needs and receiving individualised feedback. Intelligent teaching assistant systems (ITAs) are dedicated both to learners and teachers. Their aim is to facilitate the whole teaching/learning process by helping the teacher as well as the student. There has been an increasing interest to integrate the teacher as an end-user of the ITS. This paper presents the characteristics and discusses the architecture of ITAs. We illustrate the concept of ITA with two systems that we designed.