The present study demonstrates that technology can be adopted and integrated into the language classes and it should be considered as an effective and useful teaching tool for English language teachers. The purpose of this article is to investigate the effectiveness of a TAMA software, an educational content development, in Iranian absolute-beginners’ proper use of definite and indefinite article. computer assisted instruction on students’ grammatical knowledge . Forty participants were homogeneously assigned to two experimental and control groups, each group consisting of twenty participants. The experimental group were taught with the materials created through computer software material designer in the class with Interactive White Board (IWB). The control group was taught through their regular course books. During the treatment, for the experimental group, the materials were presented through both their regular coursebooks and TAMA software. However, the control group was taught, the materials only through their coursebooks. The results of the two independent samples t-tests showed that the experimental group significantly outperformed the control one.