The Development of a Computer-based Diagnostic Test for Identifying Spelling Deficiencies in Basic Thai Writing among Prathomsueksa 3 Students under Buriram Primary Educational Service Area Office 1

Abstract

The purposes of this research were 1) to study the spelling of deficiencies in basic Thai writing. 2) to create and validate the quality of the computer-based diagnostic test for identifying spelling deficiencies in basic Thai writing and 3) to evaluate the application of computer programs in conducting of the test. The samples consisted of 430 Prathomsueksa 3 students in the academic year 2024, selected by multi-stage random sampling. The research instrument was the diagnostic test for basic Thai spelling. The statistics used for the analysis were mean and percentage. The statistical methods used for data analysis consisted of mean and percentage. The instrument quality was examined using content validity, reliability, discrimination index, and difficulty index. The results were as follows 1) The diagnostic test for basic word spelling comprised three sets with a total of 45 item: Set 1 consisted of 15 items on cluster consonants, Set 2 included 15 items on leading consonants, and Set 3 contained 15 items on words with silent letters. The most common writing deficiencies identified were as follows: in Set 1, a lack of understanding of word meanings; in Set 2, mispronunciation of word; and in Set 3, an inability to recall the use of silent letters. 2) The quality of the developed diagnostic test revealed that the content validity index ranged from 0.80 to 1.00. The diagnostic test also the difficulty levels from 0.23 to 0.80, the discrimination indices from 0.20 to 0.84, and the reliability coefficient of had 0.94. 3) The results of using the computer program in conducting spelling tests revealed that it was at a high level (  = 4.28). When considering each aspect, it was found that the aspect with the highest average score was accuracy (  = 4.52).