Using Triangulation to Strengthen Your Study
Triangulation means using more than one source, method, researcher or theory to study the same question. The idea is that if different approaches point to similar conclusions, you can have more confidence in them. In this blog, we'll look at the main types of triangulation, how to use them, and how to write about them.
Why Use Triangulation:
- It can increase confidence in your findings when different sources or methods agree.
- It can give a fuller picture of a complex issue by showing different aspects of it.
- When sources disagree, the differences can themselves be revealing and worth discussing.
The Main Types:
- Data triangulation: using data from different people, times or places, for example interviewing managers, employees and customers.
- Methodological triangulation: using different methods, such as a survey and interviews, to study the same question.
- Investigator triangulation: involving more than one researcher in collecting or analysing data, for example two people coding the same transcripts.
- Theory triangulation: interpreting the data through more than one theoretical lens.
- These categories are commonly attributed to the sociologist Norman Denzin.
How to Use It in Practice:
- Plan triangulation at the design stage, not after data collection.
- Make sure each source or method genuinely addresses the same research question.
- Compare findings systematically, for example in a table showing where sources agree, add detail or disagree.
- Keep enough time and resources in your plan, as triangulation adds work.
Common Pitfalls:
- Treating triangulation as a box to tick without actually comparing the results.
- Assuming that agreement between sources proves something is true. Different methods can share the same biases.
- Ignoring findings that do not fit, instead of exploring why they differ.
Writing About Triangulation:
- In your methodology chapter, state which type of triangulation you used and why.
- In your findings or discussion, show how the different sources or methods compared and what that means for your conclusions.
Triangulation can make your study more convincing and more complete, as long as it is planned carefully and the results are compared honestly. Choose the type that suits your question, build it into your design, and explain clearly how it shaped your conclusions.