三角交叉法的意義在於使用多於一種的資料、方法、研究者、理論、分析，以研究同一個現象。此法有五個分類即:資料三角交叉、方法三角交叉、研究者三角交叉、理論三角交叉、及分析三角交叉。三角交叉若使用得當可捉弄研究結采的完整性及整體性，反之，如l會造成研究結呆的混淆及偏差。

Triangulationis an approach to research. There are five types of triangulation utilized in nursing research: data, methodological, theoretical, researcher and analysis triangulation. In this article each type of triangulation will be discussed.
The purpose of utilizing triangulation is to enhance confirmation and completeness of the study. However, triangulation needs to be chosen deliberately, for the correct reasons and rationale. Careful planning is important. Inappropriate use of triangulation will not only increase confusion but also may lead to inaccurate results.