This study was concerned with the development and evaluation of a method for estimating expected gain in reading achievement for elementary school children. The method involves the development of two-year reading gain expectancy charts for pupils in grades two, three, and four. A separate chart is developed for each of the three grade levels. Each chart is devised as a nine by nine matrix of 81 cells, with the columns representing the nine stanines of the scores on the reading achievement pretest used and the rows representing the nine stanines of the IQ measure used. Predictions were calculated by computing the average amount of gain needed by pupils for their reading achievement post-test score to fall in the same stanine as their IQ. The subjects for the study were 152 elementary school pupils, of whom 53 were in second grade, 47 in third grade, and 52 in fourth grade. The method for estimating expected gain in reading achievement proposed in this study was evaluated by comparing its results with pupils' actual gains. The predictions were also compared to the results obtained by the use of three widely used reading potential formulas, and with results obtained from the use of regression and multiple regression equations. The average deviation of predicted gains from pupils' actual gains was 1.1 years. (Author/MKM)