Research studies are broadly divided into two categories: quantitative and qualitative. Quantitative research focuses on numerical data and statistical analysis, whereas qualitative research explores meanings, experiences, and social contexts through non‑numeric methods.
Quantitative research studies
Quantitative studies aim to measure variables, test hypotheses, and generalise findings to a larger population. They rely on structured instruments such as surveys, experiments, and observations that produce numeric data.
- Experimental designs – manipulate an independent variable and use random assignment to determine causality.
- Quasi‑experimental designs – similar to experiments but without random assignment, useful when randomisation is impractical.
- Observational designs – observe and record variables as they naturally occur, including cross‑sectional, longitudinal, and correlational studies.
Qualitative research studies
Qualitative research seeks to understand the depth and complexity of human behaviour, social interactions, and cultural phenomena. Data are collected through interviews, focus groups, participant observation, and document analysis.
- Ethnography – immersive observation of a group or culture over time.
- Phenomenology – study of individuals’ lived experiences and the meanings they attach to them.
- Grounded theory – generation of a theory grounded in the data collected from participants.
- Case study – in‑depth examination of a single case or a small number of cases.
When to use each type
Choose quantitative methods when the goal is to measure the extent of a phenomenon, test a specific hypothesis, or predict outcomes. Opt for qualitative methods when the aim is to explore how people interpret events, uncover underlying motives, or describe complex social processes.
Combining both approaches
Many studies use a mixed‑methods design, integrating quantitative and qualitative data to provide a richer, more comprehensive understanding. This approach allows researchers to quantify patterns while also capturing context and nuance.