Illustration
Explanatory Diagram
noun
A diagram theory is an illustration that is used as an explanatory diagram. Just imagine a chalk board with all sorts of drawings of things, showing how they work, at least in theory.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
この参考書は図説付きです。
This reference book comes with illustrations.
アヤが、トーフグ社内の人間関係の図説を作ってくれました。
Aya made an explanatory diagram of the in-house Tofugu relationships.
もし説明と共に図説があれば、より分かりやすくなるかと思うんですが、どう思いますか？
I think it would be easier to understand if there was an illustration with an explanation, what do you think?