根據教材地位圖之上下位先後次序關係，本研究提出四種型態之教學策略， 即脈絡型、基礎型、應用型與非脈絡型。此四種教學策略，乃分別透過日本學者 竹谷誠教授所提出之「策略性教學課題系列化法」（Strategic Task Sequencing method，簡稱STS法）來制定。本研究則依據簡單的分數加法教學課題結構圖， 詳述STS法與相關演算法，以說明四種教學策略客觀嚴謹的制定過程。

According to the lower and upper relation of instructional structure graph from a given hierarchical graph, this study proposes four kinds of strategic teaching types, namely the context type, foundation type, applied type and non-context type. Four kinds of strategic teaching types are introduced by Professor Makoto Takeya. We have utilized a simple graph of instructional structure of fraction addition to illustrate STS method with performing algorithms in detail as well as to give the four strategic teaching types.