Taking logical function simplification as the background of study

this paper proposes a cognitive diagnosis model which can diagnose and correct the students’behavior for the ICAl system and conforms to chareter of human’s thinking. We discuss in detail the realization of the cognitive diagnosing system for students’behavior in logical function simplifieation. At the same time

some significant achievements trying to find the mistakes hiding in students’behavior and the causes producing the mistakes are achieved.