Value-added model, relative gain of knowledge, on-line educational testing, socio-economic facor.

This contribution deals with the possibilities of schools? results evaluation and unbiased assessment of the so called education value-added. Value-added models in education express school contribution to the progress of a pupil in relation to predetermined educational goals. The article is a comparison of two methods of the value-added assessment: method of relative shift and relative gain of knowledge method. The focus is laid on the school?s field of study as a factor which could, to a considerable extent, affect the measurement results. Both methods are used for relatively wide range of data drawn from results of secondary school pupils value-added assessments and are compared in respect to the schools? classification according to their field of study. The results show that the field of study is a significant factor influencing the value-added assessment outcomes and have to be taken into account.