現今國中理化科教學，面臨大班制、實驗設備不足、教材內容與學生現實的問題。這些問題導致教師教學困難，學生學習成就低落。如何改善這些困境，並提昇理化科教學品質，成為現今教育思潮追求的重要目標。
綜觀八十年代末期，Collin、Brown和Duguid所共同提出的情境教學理論，以及Collins進而主張電腦是推展情境教學最佳的輔助工具之理念，可改善目前國民中學的現況。本研究認為電腦輔助教學，實為一種解決問題的方案。但傳統的電腦輔助教學已無法滿足教師和學生的需求，進而開發有聲光效果，並具互動性的多媒體電腦輔助教學(Multimedia Computer-assisted Instruction，MMCAI)。
以MMCAI用來解決理化科教學問題之關鍵，在於如何獲得「符合教師與學生需求的MMCAI軟體」。研究者以「行動研究」的精神，利用WORD97、VISUALBASIC5.0等軟體結合影像擷取卡、掃瞄器等工具，採用國中理化科酸鹼鹽單元為研究主題，開發出一套超媒體系統MMCAI課程軟體。
本研究從MMCAI軟體的製作、測試與實際教學應用的過程中發現：利用MMCAI軟體來輔助國中理化科教學，確實能提高學生學習興趣。本研究內含MMCAI軟體製作流程、方法，並研討軟體在教學上的優缺點。可以提供國中理化科教師作為製作MMCAI軟體的參考，並幫助教師改善理化科教學之困境。

Nowdays the science instruction of junior high school is faced with problems concerning inadequate experimental facilities and discrepancy between the content of teaching materials and real life experiences. The two problems lead directly to unfulfillment of teaching goals and low achievements in students' learning. Accordingly, finding a way to improve what is mentioned above is undoubtedly a crucial issue in science instruction of high school.
In the late 80s, some scholars, including Collins, Brown, and Duguid, put forth the theory of situated instruction. And Collins proclaimed that computer was significant in making situated instruction popular. After studying much of the theory, the researcher began to regard CAI as a practical solution to the problems in high school science instruction. However it seemed that traditional CAI failed to meet users needs and as a result, MMCAI (Multimedia Computer-assisted lnstruction)took its place as a new trend.
A suitable MMCAI can help solve the problems. But how can we develop a workable MMCAI software which meets both teachers' and students' demands? On the basis of action research, the researcher made use of softwares like WORD97 and Visual Basic5.0. Together with the help of hardwares like motion video capture card and scanner. The researcher succeeded in producing a hypermedia system-MMCAI software.
By exploring advantages and disadvantage the applications of MMCAI softwares in teaching. The researcher hopes to present an easy access to the production of MMCAI softwares for teachers of junior high school and meanwhile, to enhance the quality of science instruction.