This study is to investigate an effect of the design education using 3D-CAD (Pro/DESKTOP) and 2D-Drafting (traditional drafting) for the junior high students through the formation experiment method of projection-construction abilities. The results of the investigation have indicated that the design education using 3D-CAD & 2D-Drafting is effective for the formation of the projection-construction abilities and clarifies that 3D-CAD supports the learning activity of the students enough.

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It increases recently that a student draws a wrong three-dimensional figure.
This study is aimed at clarifying the situation and a problem of the understanding for the expression method for the student of the technical high school.In addition, learning to understand an error was performed, and the change of the figure was examined. Three kinds of errors were extracted from the figure of the design problem by investigation.
An error was investigated by performing a test to picture a simple solid in next.As a result, error that the cross section line of the object did not lead to, two kinds of the error of the front and back position of the object were seen.For error cancellation, I performed the learning that I used the animation that a solid turned for.On the performed test, errors of the front and back position decreased afterwards. However, the errors that the cross section line of the object did not lead to increased.

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