The Development of Thai Language Principles Learning Achievement and Self-Concept of Matthayomsuksa 5 Students by Using Concept Development Model

Abstract

The purposes of this research were to: 1) compare the achievement in Thai language principles of matthayomsuksa 5 students before and after being taught using a concept development model and 2) compare the self-concept of matthayomsuksa 5 students before and after the being taught using a concept development model. The sample consisted of 33 matthayomsuksa 5 students from class 5/1 at a school in Kanchanaburi province, obtained through simple random sampling using the lottery method, with the classroom as the sampling unit. The research instruments included: 1) lesson plans based on  the concept development model with all items receiving an IOC value of 1.00, 2) an achievement test on Thai language principles with the average IOC value of 0.96, ranging from 0.67 to 1.00, item difficulty values (p) ranging from 0.41 to 0.88, discrimination index values (r) ranging from 0.45 to 0.82, and a reliability coefficient value of 0.82, and 3) a self-concept inventory with the average IOC value of 0.87, ranging from 0.67 to 1.00 and a reliability coefficient value of 0.89. The statistics used for data analysis were mean (M), standard deviation (SD), and a dependent samples t-test. The findings revealed that: 1) the matthayomsuksa 5 students’ post-intervention scores in Thai language principles were significantly higher than their pre-intervention scores at the .05 level of statistical significance, and 2) the matthayomsuksa 5 students’ post-intervention self-concept scores were also significantly higher than their pre-intervention self-concept scores at the .05 level of statistical significance.