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Programming involves complex skills and knowledge.Novice students encounter many difficulties and lack information for reflecting and improving their proficiencies in programming skills and knowledge.This paper presents a work-in-progress research to design a system with an open student model based on an assessment framework of iteration programming.The assessment framework includes strategies of counter-controlled loop and sentinel-controlled loop,implementation skills of while,for,and do-while,and program tracing abilities.The system presents open student models to students in order to assist students in reflecting their proficiencies in iteration programming.