The aim of this dissertation is to prove the value and potentiality of blended learning by means of customization of server program. The verification is done through examination of the following two subjects.
Subject 1. How can language teachers make their original online teaching/testing materials which reflect their own instructional designs?
Subject 2. How effective is blended learning?
The cognitive scientific method called “computer simulation" is adopted for Subject 1. The mobile server software “MY Server" is used for it. Statistical research is done for Subject 2.
Following three online teaching materials were created by the author for blended learning.
(1) Online Placement Test; OPT
(2) Online Vocabulary Practice; OVP
(3) Online English Reading Practice; OERP
In OPT and OVP, teachers' instructional designs were successfully demonstrated and it was proved that the computer simulation is an effective way to find and express their hitherto unconscious ideas. For Subject 1, the author proposes computer simulation as a useful way for language teachers to create their own online teaching materials. With OERP, the class average of final grades was greatly improved and it is judged that blended learning has a positive effect. Blended learning changes classes favorably not only in quantity of learning but also in quality. This conclusion suggests an affirmative answer for Subject 2.