We developed a new lecture style for elementary
programming education named Program Reading
Practice by using the Computer Graphics Animation
programs. (Named WinTK). In this practice, students read
the source codes of various kinds of Computer Graphics
Animation programs and challenged to modify or extend
these programs instructed by teacher (Program Re- Write
Practice). We have done this practice for six years and
investigated various kinds of results in order to acquire the
effect objectively. In this paper, we describe about the
investigation way and the several results of our practice.