🎯 The Short Answer: Literature snowballing is a good way to find relevant academic sources by starting with a few strong papers and using their reference lists discover more papers. You “snowball” backward and forward through the literature until you’ve identified the most relevant and valuable studies in your field.
Many first-time researchers ask us the same question: What is literature snowballing, and how do I actually do it? In this post, we’ll break it down in plain English and show you exactly how to use this powerful method to build a solid foundation of sources for your dissertation or thesis.
🔎 What Is Literature Snowballing?
Literature snowballing is a search strategy where you start with a small set of highly relevant articles and use them to find more related studies. Instead of relying only on keyword searches in databases, you “follow the trail” of citations.
Think of it like rolling a snowball down a hill. You begin with a few strong papers, and as you move through their reference lists and citations, your collection of sources grows bigger and more focused. Over time, you start to see the same key authors and studies appearing again and again. That’s usually a sign you’ve found the core literature in your field.
📚 Step 1: Start With 10 Strong Papers
The first step is to find around 10 solid, highly relevant articles. Read the abstracts carefully and ask yourself, “Does this directly relate to my research topic?” If the answer is yes, add it to your starter set.
Once you’ve selected your articles, read them properly. Take notes as you go, especially when you’re reading the literature review section. This is where authors summarise the key studies in the field, which gives you a ready-made map of important sources.
This issue comes up very often in our private coaching sessions, especially when students rely only on database searches and feel stuck in a sea of irrelevant results. Starting with a carefully chosen set of core papers makes everything more focused and manageable.
🔁 Step 2: Snowball Backward
Backward snowballing means looking at the reference list of each paper you’re reading. As you go through the article, highlight or note any studies that seem closely aligned with your topic.
Then, go to the reference list, find the full citation, and track down that paper in your university’s database. Read the abstract, check its relevance, and if it fits, add it to your growing list. Repeat this process again and again.
After a while, you’ll notice something interesting. The same studies will keep appearing in multiple reference lists. That repetition is a strong signal that you’ve identified foundational or “seminal” work in your area.
⏩ Step 3: Snowball Forward
Backward snowballing looks to the past. Forward snowballing looks to the future. In other words, you check which newer papers have cited the article you’re reading.
A simple way to do this is through Google Scholar. Under each article, you’ll see a small link that says “Cited by” followed by a number. Click that, and you’ll see a list of newer papers that have referenced the original study. This helps you move forward in time and find more recent research.
You can also use tools like Research Rabbit or Connected Papers. These platforms create visual networks of related studies, making it easier to see connections between papers. Just be careful to check that the articles you select are from reputable, peer-reviewed journals and are indexed in recognised academic databases.
📅 Don’t Forget Recent Research
One important limitation of literature snowballing is that it often leads you to older studies. That’s not necessarily a bad thing. Many theories and foundational models were published decades ago and are still essential today.
However, most universities expect you to include a good amount of recent literature, often from the last five to ten years. So while you’re snowballing through classic and influential studies, you also need to deliberately search for newer research.
Go back to your academic databases and apply date filters, such as “last five years” or “since 2020.” This ensures your literature review reflects the current state of knowledge, not just the historical foundations. The goal is balance: include the seminal works, but also show that you understand the latest developments in your field.
📌 Key Takeaways
- Literature snowballing means using reference lists and citations to build a focused set of relevant sources.
- Start with around 10 highly relevant papers and read them carefully, especially their literature reviews.
- Use backward snowballing to explore reference lists and identify foundational studies.
- Use forward snowballing, such as the “Cited by” feature in Google Scholar, to find newer research.
- Balance older seminal works with recent studies by applying date filters in academic databases.
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