Instructional media is an important instrument for teaching and learning. 
Computer assisted instruction can be used to help each individual student
achieve educational learning and to satisfy personalized  learning need by 
requiring an active participation in the process of education. The researcher 
has led the good  points of  the computer assisted instruction, and developed 
computer assisted instruction, for use as a teaching and learning instructional 
media.   

The purposes of  this  research  were  

1)  to  construct  a computer assisted  instruction for fundamental English on
" Eat Well and Stay Healthy "  for Mathayomsuksa 2 students.

2) to compare learning achievement between the experimental group  by 
using the computer assisted instruction  and the control group by using the 
conventional method. The samples were 80 Mathayomsuksa 2 students of 
Bunharnjamsaiwittaya 5 School, Songpeenong District, Suphanburi Province
during the second semester of 2002 academic year. They were selected by
using single stage cluster sampling technique and assigned as an experimental
group (n=40) using computer assisted instruction, and a control group
(n=40), using the conventional method. The treatment duration was eight 
periods, 50 minutes each. 

The instrument consisted of  : 

1)Computer Assisted Instruction for Fundamental English  on
"  Eat  Well  and  Stay  Healthy  " for  Mathayomsuksa 2 Students, 

2)Conventional Lesson Plans, 

3) An  achievement  test. The data were statistically analyzed by using 
percentage , arithmetic mean (  ), standard  deviation (SD) and  t-test
using  SPSS  for  windows.

The results of the study were as the following :
   
1. The efficiency of Computer Assisted Instruction for Fundamental English 
on " Eat Well and Stay Healthy " for Mathayomsuksa 2 Students met the 
efficient standard criterion of 84.0 / 76.22, which was higher than the
selected efficient standard criterion of 75/75
	
2. The comparison of the learning achievement of the experimental group 
after using Computer Assisted Instruction ( =23.73) was significantly higher
than that of the conventional method group ( =21.55) at  the 0.01  level