The Methodology Inventory is a 76-item 4-point measure divided into eight scales designed to determine what behaviors a teacher engages in while teaching. The eight scales are stimuli for writing, prewriting, writing, revising/editing, evaluation, language development, varieties of discourse, and publication of written work. The instrument was administered over a 3-year period to 104 English language arts teachers who were participants in various writing project summer workshops. An item analysis of the results was performed to determine (1) the reliability of the total instrument, (2) the reliability of items within each scale, and (3) the intercorrelation among scores on the scales. Results showed that the instrument as a whole had a high reliability coefficient and that each of its eight scales was internally consistent. Low to moderate intercorrelations among the scales suggested that there was a commonality that cut across the scales; yet the commonality was not so large as to suggest that the scales were not somewhat independent of each other. (Extensive tables of data and a copy of the instrument are appended.) (FL)