The Trainee Teacher Support System (TTSS) is an Expert System for advising student trainee teachers regarding events which occur during their lessons. The knowledge base contained within the system is modelled upon the experienced school-based 'teacher-tutor' (Lacey et al. 1974; 1977; Eggleston, 1985; Wood and Pateman 1990) - an experienced teacher in the school participating in teacher training, who typically advises trainee teachers regarding their lesson practice. This knowledge was derived through eliciting the responses of experienced teachers to videos of trainee teachers conducting problematic lessons. (Wood 1986).
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