The objective of this research is to study relation level between personal factor and mixing factor of the marketing and the decision- making to buy the portable computers of Krirk university students. The sample group is 351 Krirk university students. The research tool is the questionnaire. Data analysis is described as percentage value means standard deviation t-test and F-test. The results showed that personal factors including gender age level of education salary and influenced persons are related to the purchase of portable computers of Krirk university students at the 0.01 level. It was also found that mixing factors of marketing price place and marketing promotion has a statistically significant positive relationship with decision-making of the purchase of portable computers of Kirk university students at 0.01.

The purposes of the research were to create and find out the efficiency validation of computer assisted instruction focused on the Plastic Injection Adjusting Machine and Injection Molding Maintenance for the standard 90/90 and to analyze the students’ learning achievement after using computer assisted instruction. The samples were 20 first year diploma tool & die students at Rajamangala Institute of Technology North Bangkok Campus. The students pretested and then studied by using the computer assisted instruction focus on the plastic Injection Adjusting Machine and Injection Molding Maintenance. Finally the students post tested. After that the data was calculated to find out the computer assisted instruction efficiency and analyzed the students’ learning achievement after studying. The result revealed that the computer assisted instruction efficiency was reached the standard 90/90 and the students’ learning achievement increased significantly at 0.05.