A computer program called TEXAN (Textual Analysis of Language Samples) was developed for use in calculating frequency of characters, words, punctuation units, and stylistic variables. Its usefulness in determining readability levels was examined in an analysis of language samples from 20 elementary tradebooks used as supplementary reading materials. Three 200- to 300-word samples were selected to represent the beginning, middle, and end of each book. The TEXAN program was used to analyze the 60 samples according to four readability formulas: Gunning's "Fog" Index, Spache's Grade Level Indicator, Flesch's Reading Ease Index, and Flesch's Human Interest Index. Chi-square analysis and analysis of variance indicated that the samples were internally consistent. Relatively high correlations were found between the Gunning and Spache formulas, moderately low correlations were found between the Flesch formulas, and negative correlations were found between the two Flesch formulas and the Gunning and Spache formulas. It was concluded that the TEXAN program can be useful in analyzing readability, particularly when more than one formula is to be applied to a sample. Tables are included. (MS)