A literature review must begin at a level where a body of literature exists, then narrow toward the study context; otherwise, there is nothing to synthesise and no meaningful gap can emerge.
A literature review is not a description of your specific study context.
It is a synthesis of existing knowledge that leads to a research gap.
That distinction matters.
A common mistake is to begin the literature review at the exact level of the intended study — for example, a single country, population, or narrowly defined intervention.
When this happens, students often conclude:
“There is no literature.”
In most cases, that conclusion is false.
The problem is not that a gap exists.
The problem is that the review started too narrowly to support synthesis.
The Core Principle
A literature review must begin one conceptual level broader than the study itself.
Not because the gap becomes more “meaningful,”
but because the review must have enough material to analyse, compare, and organise.
If you only have two or three highly specific studies:
there is nothing to synthesise
no patterns to identify
no debates to map
no structure to build
And therefore, no literature review.
The Funnel Logic
Every literature review follows the same conceptual shape:
Broad → Focused → Precise → GAP
Crucially, the review must begin one level broader than the study itself.
The key rule is simple:
The review must start at a level where a body of literature actually exists,
then narrow toward the specific context of the study.
Starting one level broader allows the reviewer to:
synthesise existing knowledge
identify recurring themes or mechanisms
observe disagreements or inconsistencies
see where evidence thins out
Only after this process does the research gap emerge.
Example: Maternal Health in Zimbabwe
If the intended study is:
barriers to maternal health access in Zimbabwe
The literature review should not start at “Zimbabwe.”
At that level, there may be only a handful of papers — too few to review meaningfully.
Instead, the review might progress through:
global maternal health
maternal health in Sub-Saharan Africa
general barriers to access
regional or comparable country evidence
Zimbabwe’s position within that body of work
then the GAP
By the time the reader reaches Zimbabwe, the broader evidence base has already been established.
The gap is visible because the landscape is clear.
Example: Teacher Burnout in Rural India
A review on:
burnout among rural secondary school teachers in India
should not begin at that exact niche.
A workable funnel might look like:
definitions and theories of burnout
burnout across professions
burnout among teachers globally
regional or LMIC evidence
rural or contextual factors
the specific Indian setting
then the gap
At each stage, the review operates where enough studies exist to support synthesis.
Why This Matters
If a literature review starts too narrowly:
there is insufficient material to review
the structure collapses
the “gap” is a function of scarcity, not insight
If it starts too broadly:
the review becomes unmanageable
focus is lost
synthesis never converges
The purpose of the funnel is not rhetorical flourish.
The funnel exists to guide the reader smoothly to the precise problem your study will address.
If a literature review does not begin where a body of literature exists, it cannot perform its core function: synthesis. The funnel is what makes a literature review possible in the first place.
