In Japanese, the expression ādeep understandingā is used. According to this expression, the ādeep understandingā axis is downward, but for the author, upward seems more natural. The higher the level of abstraction, the higher the āwhyā of why something is done or why something works, and the lower the concrete knowledge or āhow-toā (how to do something). I also think that āwide field of visionā extends to the left and right, and āapplication,ā which is difficult to see, is in the depth direction (Fig. a). I have no firm evidence for this.
Figure a. Orientation of the three axes as imagined by the author.
Chapter 1: How to Learn Efficiently - Three Axes of Knowledge and Three Phases of Learning: How Engineers Learn - How to Gain Knowledge Efficiently and Gihyo.jp ā¦ Gijutsu-Hyoron Co., Ltd.
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