What is a Research Gap? And How Can You Identify a Research Gap?

Dr. Mashiur Rahman

We often view science as a realm of completeness—as if all the answers to our questions are stored somewhere, and researchers simply go hunting for them. In reality, it’s quite the opposite. In the world’s largest repositories of knowledge—Nature, Science, The Lancet, or IEEE—each of the thousands of submitted studies is born out of a place where clear answers do not yet exist. In research terminology, this unknown area is called the research gap.

According to scientific journal Nature, 74 percent of research papers published in the last decade began with a limitation of previous knowledge or an unexplored question. In other words, science advances by chasing the unknown, not what is already known. Yet, standing in the corridors of universities, the first question new researchers often ask is, “Where can I find the research gap?”

This question is as common as it is profound. A research gap is actually the story of an absence—a place where science has yet to reach, or where a wrong turn means a return and a fresh start. It is like a dark room that, once illuminated, reveals a new world.

The research gap isn’t just a ‘gap’; it is the heartbeat of research thinking. But what exactly is this gap? From social sciences to engineering, research gaps arise from three sources: unanswered questions, methodological limitations, and new realities.

Take, for example, the science of climate change. Between 2001 and 2021, there were 140,000 studies on climate, and a third of these began with questions no one had previously understood well—how fast are sea levels rising, at what rate is the ice really melting, or what is the true count for the global carbon budget? All these are the result of research gaps.

This reality is even more evident in medical science. A report in ‘The Lancet’ states that 80 percent of global medical research data is based on western populations. As a result, the real questions of Asia, Africa, or South America—disease behavior, genetic diversity, or treatment outcomes—remain largely unexplored. In other words, generalizing a geographical context incorrectly gives rise to new research gaps.

From this, it becomes clear that the research gap isn’t a hidden treasure with a secret map. It is created by societal change, the progress of science, and an attentive researcher. The curious researcher, who keeps asking after every paper—“What’s missing here?”—is the one who finds the gap.

Still, the question remains—Is finding a gap really that simple? Of course not. A major part of research is being well-versed in existing knowledge. Researchers in research methodology say that a strong literature review is not just about reading papers; it’s like detective work. Every paragraph, table, and limitation in a paper can give birth to a new gap.

In the digital age, this process is even more complex. Google Scholar notes that over three million research papers are published worldwide each year. With such a massive pile of information, it is impossible for a new researcher to read all the studies in their field in a lifetime. Yet it is surprising—according to a Harvard study, 65 percent of successful research begins by reading just 30 papers in depth. In other words, gaps can be found from a small amount of information, if the researcher has the ability to ask questions.

On the other hand, a research gap isn’t just about unexplored questions; often, it’s the story of methodological limitations. In biological research, Nature Methods reports that 58 percent of projects begin with the aim of correcting previous errors or limitations in methodology. Small sample sizes, measurement errors, incomplete variables, or inadequate models—all of these force the next researcher to think differently.

But gaps aren’t born only within science; social, technological, economic, and policy changes often generate new questions. In the field of artificial intelligence, since 2015, research on AI-related social issues has increased by 300 percent. Questions like how unbiased are algorithms, how secure is data privacy, and how ethical is AI in medical decisions come not from previous research papers but from changes in real life.

Yet even after all this, a fundamental question remains—how do you know the gap you have identified is truly a research gap? According to Nature’s editors, papers that clearly and strongly explain the gap are 1.5 times more likely to be accepted. This means a gap is only acceptable when it meets three criteria: it must be relevant, novel, and researchable.

Let’s look at a real-life example. If you are researching microplastic pollution in Bangladesh, the gap could be—“Which sizes of microplastics are most prevalent in the rivers and coastal zones of Bangladesh?” International research shows that 60 percent of papers on microplastic pollution in South Asia focus on India or Sri Lanka, with Bangladesh nearly unstudied. Here, the geographical void itself is the gap.

Or, in social sciences—there are almost no studies on the impact of AI-based employment shifts in Bangladesh. Yet, according to World Bank data, 47 percent of jobs in the country are at risk of automation in the next two decades. Here, the gap arises from society’s rapid change.

Viewed this way, it’s clear that research gaps aren’t hidden anywhere in reality; they are created continuously, with every change in society. The researcher’s role is simply to identify the right question within these changes.

Science is, in truth, a journey in search of light. For centuries we have seen that Nobel-winning research often comes from areas previously ignored. An analysis of Nobel Prize-winning research published from 1970 to 2020 shows that 60 percent of discoveries emerged from ‘interdisciplinary’ regions, where connections between two fields were weak, and that very weakness was the actual gap.

This is why a research gap is not a void; it’s a door. The darkness beyond that door is what the researcher must illuminate. And it is this sense of responsibility that propels science forward—from one answer to the next question.

If you are an emerging researcher, your greatest power in today’s world is your ability to ask questions. What is already known holds no answer. The answer is hidden in the unknown. And that journey into the unknown begins with a simple question—“Has anyone yet seen anything here?”