Prior CTA Of The Item Difficulty Of Middle School Physics Examination In Shanghai

Using the particular frame and procedure of CTA developed by Shao and Yu (2008) for prior evaluation of item difficulty, we labeled the item-difficulty-values for High school(and university) physics entrance examination test of Shanghai (2007- 2010) by two raters. The assessment frame consists five indexes:number of elements about one item, element identification difficulty, number of principles in answering, principle identification difficulty and cognitive load.It just need us to give the number of element and principle when they are labeled; The Structure of Intellect(SOI) developed by Guilford was introduced as a reference when we labeled the indexes of the element and principle identification difficulty, and the rankble nature of SOI in the dimension of product to be used in these two indexes rating. The five levels of the operate dimension are inferenced when we elaborate the index of cognitive needs(except cognitive load).As for afterwards difficulty data, the passing rate for the university entrance examination of 2008 from the university entrance examination. And the passing rate and the time for solving each test item for the middle school entrance examination of 2010 from 21 subjects.From the discussion on the results of prior and afterwards difficulty, the conclusion is as follows:(1) After redefining the levels of the product in Guilford's Model of the Structure of Intellect, it can be as a assessment basis for the difficulty of element and principle identification in CTA prior difficulty rating; the level of operate also can be as a basis in rating the cognitive needs;(2) The favorable reliability and validity of the redefined CTA prior difficulty rating method were validated in High school(and university) physics entrance examination test of Shanghai;(3) The prior difficulty acquired from CTA prior difficulty rating is the difficulty of one test itself,without regard to the factor of the problem Solver, so the correlation between afterwards difficulty and prior is not very high;(4) The difficulty's fluctuation of the latest four years High school and university physics entrance examination test are not marked.