Abstract
In the original T-type matrix, the development processes needed to be written twice, causing the chart to be wide, and difficult to make when using a spread sheet type software. But by making review a must after system designing and programming, T-type Matrix can be folded into half, thus making the chart half the size of that of the original. Not only this, but also by aligning the development processes from left to right, it has made it easier to enter and to acknowledge the number of mistakes made during the development process. By using T-type matrix, evaluation metrics for five projects have been calculated. Unnoticed Percentage/Technical Evaluation Percentage/Prevention Percentage was, between 6.3% and 23.2% / between 94.1% and 82.8% / between 65.6% and 52.0%. Since there is not enough evaluated counts to tell whether these metrics are appropriate, an examination is not being made
