Research Methods in Criminal Justice: Qualitative vs Quantitative
This paper surveys the major research methodologies used in criminal justice and criminology, comparing qualitative and quantitative approaches and explaining when each is appropriate. It walks through the five steps of the scientific method and examines four types of quantitative designs — true experimental, quasi-experimental, correlational, and descriptive — using recidivism and drug treatment programs as recurring examples. The paper also addresses longitudinal designs, sampling strategies, and the central importance of reliability and validity. Together, these concepts illustrate how evidence-based criminal justice policy depends on rigorous, well-chosen research design.
- Introduction: Research in Criminal Justice: Evidence-based policy and research relevance in criminology
- Qualitative vs. Quantitative Research: Comparing the two main branches of social science research
- The Scientific Method in Criminal Justice Research: Five steps of the scientific method applied to criminal justice
- Experimental and Quasi-Experimental Designs: True experiments and quasi-experiments for establishing causality
- Correlational and Descriptive Research Designs: Correlational studies and descriptive methods as starting points
- Longitudinal Studies and Sampling Strategies: Long-term designs and reliable sampling techniques
- Conclusion: Reliability, Validity, and Evidence-Based Policy: Reliability and validity as core research priorities
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What makes this paper effective
- Uses a single consistent example — the effect of drug treatment programs on recidivism — across multiple design types, making abstract methodological distinctions concrete and easy to follow.
- Clearly distinguishes between what each design can and cannot establish (causality, correlation, directionality), preventing common student misunderstandings.
- Balances breadth and depth: it covers five design types without becoming superficial, anchoring each with a practical scenario from real criminal justice settings.
Key academic technique demonstrated
The paper demonstrates effective comparative exposition: each research design is introduced in relation to the ones before it, forming a hierarchy from least to most methodologically rigorous. This technique helps readers understand not just what each method is, but why a researcher would choose one over another — a skill central to research-methods writing.
Structure breakdown
The paper opens with a framing section on evidence-based policy before distinguishing qualitative and quantitative approaches. It then traces the scientific method and moves through four quantitative design types in descending order of rigor: true experimental, quasi-experimental, correlational, and descriptive. A penultimate section on longitudinal designs and sampling applies across all design types. The conclusion ties the discussion back to the themes of reliability and validity introduced early in the paper.
Introduction: Research in Criminal Justice
A variety of methods and designs can be used in criminal justice research. Both qualitative and quantitative methods are valid approaches to the sociological questions researchers face when confronted with pressing problems and issues. Ideally, criminal justice research should remain relevant, grounded in theory, and applicable to public policy or practice. Criminal justice policies and procedures can and should be evidence-based. Scientific research in criminal justice helps to identify which interventions or policies work and which do not, based on quantitative data or on phenomenological factors such as public opinion.
Qualitative vs. Quantitative Research
The two main branches of social science research are qualitative and quantitative designs. Qualitative research is not necessarily inferior to quantitative research in the social sciences, because measurable outcomes cannot account for all aspects of the human experience. Researchers will often use qualitative methods — such as in-depth interviews, case studies, and focus groups — to gather information, ask open-ended questions, and identify variables that can later be tested more empirically. Qualitative research can therefore become the forerunner to quantitative research.
Many criminal justice researchers also opt for mixed methods or multimethod approaches, which allow for the integration of data from both types of studies (Maxwell, Chmiel & Rogers, 2016). Unlike quantitative research, qualitative research is driven by questions rather than hypotheses, and does not purport to establish causal or even correlative connections between variables. Quantitative research, by contrast, is based on the scientific method.
Components shared by both qualitative and quantitative research methods include the necessity of defining terms (operationalizing), outlining gaps in the literature or the motivation for the current research, and explaining the researcher's theoretical orientation. Research often follows from theory, but research can also inform or enhance existing criminal justice theory. Likewise, researchers must explain why they selected a particular design and methodology. Issues related to reliability and validity are as important in qualitative as in quantitative research in the social sciences.
References
"Criminology and Criminal Justice Research: Methods — Quantitative Research Methods." (n.d.). http://law.jrank.org/pages/923/Criminology-Criminal-Justice-Research-Methods-Quantitative-research-methods.html
Flom, P. (2018). Five characteristics of the scientific method. Sciencing. https://sciencing.com/five-characteristics-scientific-method-10010518.html
Maxwell, J. A., Chmiel, M., & Rogers, S. E. (2016). Designing integration in multimethod and mixed method research. In S. N. Hesse-Biber & B. Johnson (Eds.), The Oxford Handbook of Multimethod and Mixed Methods Research Inquiry. Oxford University Press.
"Quantitative Approaches." (n.d.). Center for Innovation in Research and Teaching. https://cirt.gcu.edu/research/developmentresources/research_ready/quantresearch/approaches
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