Methodology

Methodology and Research Standards

Transparent methods proportionate to the question and context—from defining the problem to publishing and correcting findings.

Design principle

Research begins with the question and the decision the finding is intended to support—not with the instrument. Concepts, population, time, and geography are reviewed before selecting design, data sources, sample, instrument, and analysis plan.

Research cycle

  1. Define the problem, purpose, and intended users.
  2. Formulate questions, objectives, concepts, and indicators.
  3. Select design, data sources, and sample.
  4. Develop, translate, review, and test instruments.
  5. Prepare fieldwork, training, quality, and ethics plans.
  6. Collect data, monitor implementation, and document deviations.
  7. Clean, code, weight, and analyze data.
  8. Review findings, tables, narrative, and limitations.
  9. Prepare deliverables and methodological disclosure.
  10. Publish or deliver and manage corrections and data.

Possible methods

Quantitative research

Surveys, experiments, administrative data, and statistical analysis where measurement, comparison, and inference are central.

Qualitative research

Interviews, focus groups, observation, and document analysis to understand experience, meaning, context, and mechanisms.

Mixed methods

Structured integration of measurement and explanation, identifying each component’s role and how results are combined.

Secondary research

Analysis of existing data, documents, and sources with assessment of quality, compatibility, and definitions.

Participatory research

Involve relevant groups in questions or interpretation without transferring professional responsibility to them.

Digital research

Use digital tools or data subject to privacy, quality, and transparency controls.

Sampling and inference

  • Define population, frame, and unit of selection.
  • Determine size and allocation according to precision, comparison needs, and resources.
  • Document exclusions, nonresponse, and replacement.
  • Apply and describe weighting where needed.
  • Do not call a sample representative unless the design supports it.
  • Use caution with small cells and multiple comparisons.

Instrument design

  • Clear, neutral language appropriate to participants.
  • One concept per item where possible.
  • Balanced and reasonably exhaustive response options.
  • Ordering that reduces leading and context effects.
  • Logical, technical, and cognitive testing.
  • Version, translation, and change documentation.

Data collection and quality

Quality controls differ by collection mode and may include training, testing, observation, verification calls, duration and logic checks, duplicate and location checks, authorized audio review, and open-response review. Automated indicators are not used alone for punitive decisions without human review.

Analysis and interpretation

  • Analysis plan tied to research questions.
  • Clear indicators, rules, and missing-value treatment.
  • Attention to sample design and uncertainty.
  • Distinction among description, association, and causation.
  • Alternative specifications and sensitivity analysis where needed.
  • Presentation of meaningful differences without selection.
  • Interpretation connected to context and limitations.

Related standards

Quality Assurance

Review, responsibilities, checks, and error treatment.

Research Ethics

Consent, voluntariness, harm minimization, and safeguarding.

Privacy and Data Protection

Data minimization, security, retention, and sharing.

Independence and Transparency

Limits on commissioner influence, funding, and conflicts.

Publication and Disclosure

Information accompanying each output and methodology.

Corrections and Withdrawal

Treatment of errors, revisions, and invalid materials.

Digital Research and AI

Controls for digital tools, automation, and human verification.

Study protocol and inception document

  • Problem, purpose, and intended users.
  • Primary and secondary questions, concepts, and indicators.
  • Population, unit of analysis, and geographic and temporal scope.
  • Data sources, sampling design, and collection mode.
  • Analysis plan, deliverables, and methodological disclosure.
  • Quality, ethics, data-protection, and safety plan.
  • Roles, approvals, schedule, and scope-change rules.

Sampling frames and coverage

A sampling frame is assessed for coverage, duplication, currency, and accessibility. Where a complete probability frame is unavailable, the alternative and resulting limitations are explained. Depending on the question, studies may use stratified, clustered, systematic, multistage, purposive, theoretical, or typical-case sampling.

Nonresponse and replacement

  • Define contact outcomes, ineligibility, refusal, and partial completion.
  • Record attempts, timing, and outcomes consistently.
  • Do not automatically replace a selected unit without an approved rule.
  • Examine respondent and nonrespondent differences where feasible.
  • Use weights or sensitivity analysis where appropriate.
  • Report response or completion indicators understandably.

Translation and cultural adaptation

Translation is reviewed for conceptual equivalence and comprehensibility rather than literal matching alone. The process may include initial translation, bilingual review, back-translation where useful, cognitive testing, and documentation of terms without a direct equivalent.

Data-collection modes

Face-to-face

May cover groups missed by digital modes but requires safety, supervision, and attention to interviewer effects.

Telephone

Can support rapid reach but requires assessment of number coverage, response, and privacy.

Web

May reduce some implementation costs but can exclude disconnected populations and increase self-selection or duplication risk.

Qualitative methods

Provide depth and explanation but do not produce population percentages unless the design supports them.

Administrative data

Require understanding of original purpose, quality, coverage, and changes in definitions.

Mixed mode

Requires a plan explaining why modes are combined and how mode differences are handled.

Data and code management

  • Variable dictionary and consistent naming convention.
  • Untouched source copy and dated working versions.
  • Cleaning, coding, transformation, and indicator-derivation log.
  • Independent code or table review where feasible.
  • Separation of identifiers from analytical data.
  • Backups, permissions, and deletion according to plan.

Reproducibility

Analysis should be reproducible through code or a clear processing record, with fixed data versions and rules. Where confidentiality prevents data or code release, a methodological description or intermediate tables may support reasonable review without exposing restricted information.

Mixed-method integration

  • Identify whether integration is concurrent or sequential.
  • Explain whether one component explains, builds on, or validates another.
  • Do not erase conflict among sources without examination.
  • Connect each conclusion to the source or component supporting it.
  • Present convergence, divergence, and evidence gaps.

Uncertainty and sensitivity

Margins of error or confidence intervals are reported where appropriate, together with design effects, weighting, and small-cell limitations. Sensitivity analysis may test missing data, definitions, rules, or assumptions. Excessive numerical precision should not conceal genuine uncertainty.

Post-project methodological review

After delivery or publication, problems, deviations, lessons, and required updates are reviewed. A close-out record or learning meeting may distinguish individual error from a system issue and recommend an implementable change to templates, training, or systems.