Abstract:
The purposes of this study were to construct the instructional packages in Life Experiences Area on "the Sound" for Prathom Suksa 4 students, and to find the efficiency of the instructional packages by using the standard criterion 80/80.The instruments used in the study were 6 instructional packages on "the Sound" and a 60-item achievement test of the instructional package in Life Experiences Area. The level of difficulty ranged from .22-.79; the discrimination power was from .20-.70; and the reliability was 0.76.From the experiment, the efficiency of the instructional packages, constructed for 25 Prathom Suksa 4 students sutdying in the thrid term of the academic year of 1991 of Dan Khun Thot School, was found to be 86.80/91.00, Which was higher than the standard criterion 80/80 as set.