In the world of research, “literature review” is a fundamental task. However, not all literature reviews are the same. The type of review can vary depending on the research question, purpose, and methodology. Among these, the two most discussed types are the systematic review and the narrative review. It is extremely important for early-career researchers to understand the differences between them.
A narrative review is a comparatively flexible approach. Here, the researcher selects a topic and summarizes the existing research around it. Typically, it is written by reading significant articles and books published within a specific time frame and basing the discussion on them. In a narrative review, the researcher uses their own analytical perspective and provides readers with an overall understanding. Its main strength is flexibility, but its weakness is that it can sometimes be incomplete due to researcher bias or limited selection.
On the other hand, a systematic review is much more structured and rigorous. Here, the researcher defines a specific research question and then finds all relevant articles related to that question based on predetermined criteria. These are then analyzed within a particular framework. A systematic review often includes a protocol, specifying how articles were selected, how data were analyzed, and what criteria were used. Its strength lies in being far more reliable and evidence-based. However, its limitation is that it is time-consuming and complex.
For example, if a researcher wants to know “How does air pollution in Dhaka affect children’s health?”, in a narrative review, they might read a few articles published in the last ten years and present a general picture based on them. But in a systematic review, they would need to specify which databases were searched, which keywords were used, how many articles were excluded, and how many were included for analysis.
For young Bangladeshi researchers, the reality is that many start with narrative reviews due to limitations of time and resources. This is a good practice, as it helps to build a foundational understanding of the topic. However, those aiming for international standards in research will need to gradually move toward systematic reviews. Especially in health sciences, public health, social sciences, and policymaking, the importance of systematic reviews is immense.
In summary, a narrative review is an attempt to paint a broad picture, while a systematic review is a method to measure that picture precisely. Early-career researchers should decide which type of review suits them best, based on their research goals and context.
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