Limitation groups
Scope
Sample · Geography · Temporal
Measurement
Validity · Quant–qual · Replicability
Inference
Causation · Generalisability
Data & Tech
Technology · Ethics
Context
Subjectivity · Scale · Discipline
Access
Participation · Funding
Small sample / few cases
is your most common limitation (6 papers)
Most constrained paper: He '24
(5 limitation types)
Small sample / few cases
6 papers
Limited number of sites, participants, or case studies
Jacobs '61Lynch '60Whyte '80He '24Karban '25Ferwati '21
Generalisability
5 papers
Results cannot be reliably applied to other contexts
Jacobs '93Jacobs '61Lynch '60Whyte '80Ferwati '21
Measurement validity
4 papers
Difficulty quantifying abstract or perceptual qualities
Gehl '11Lynch '60Karban '25Ferwati '21
Geographic / cultural scope
3 papers
Findings tied to one city, country, or cultural context
Jacobs '93Gehl '11He '24
Replicability / transparency
3 papers
Methods hard to reproduce or lacking methodological detail
He '24Karban '25Ferwati '21
Subjectivity / observer bias
3 papers
Qualitative judgement, researcher interpretation, or self-report bias
Jacobs '61Lynch '60Karban '25
Correlation vs causation
2 papers
Cannot establish causal relationships from observational data
Jacobs '93Karban '25
Temporal / cross-sectional
1 paper
Single snapshot in time — no longitudinal or seasonal data
Gehl '11
Technology / data constraints
1 paper
Limited by tools, sensors, or data availability at time of study
Whyte '80
Ethical / access constraints
1 paper
IRB, privacy, or access restrictions affected data collection
He '24
Disciplinary silos
1 paper
Ignores adjacent fields or does not integrate cross-disciplinary evidence
He '24
Stakeholder / community access
1 paper
Limited access to users, communities, or decision-makers
Ferwati '21
Limitation types not identified in your papers
Quant–qual integration gapScale specificityResource / funding constraints