Research Designs

The design is the structure of any scientific work. It gives direction and systematizes the research.

The method you choose will affect your results and how you conclude the findings. Most scientists are interested in getting reliable observations that can help the understanding of a phenomenon.

There are two main approaches to a research problem:

• Quantitative Research
• Qualitative Research

What are the difference between Qualitative and Quantitative Research?

DIFFERENT RESEARCH METHODS

There are various designs which are used in research, all with specific advantages and disadvantages. Which one the scientist uses, depends on the aims of the study and the nature of the phenomenon:

Descriptive Designs

Aim: Observe and Describe

• Descriptive Research
• Case Study
• Naturalistic Observation
• Survey (The Questionnaire is also a technique used in many types of research designs)

Correlational Studies

Aim: Predict

• Case Control Study
• Observational Study
• Cohort Study
• Longitudinal Study
• Cross Sectional Study
• Correlational Studies in general

Semi-Experimental Designs

Aim: Determine Causes

• Field Experiment
• Quasi-Experimental Design
• Twin Studies

Experimental Designs

Aim: Determine Causes

• True Experimental Design
• Double-Blind Experiment

Reviewing Other Research

Aim: Explain

• Literature Review
• Meta-analysis
• Systematic Reviews

Test Study Before Conducting a Full-Scale Study

Aim: Does the Design Work?

• Pilot Study

TYPICAL EXPERIMENTAL DESIGNS

SIMPLE EXPERIMENTAL TECHNIQUES

• Pretest-Posttest Design
• Control Group
• Randomization
• Randomized Controlled Trials
• Between Subjects Design
• Within Subject Design

COMPLEX EXPERIMENTAL DESIGNS

• Factorial Design
• Solomon Four-Group Design
• Repeated Measures Design
• Counterbalanced Measures Design
• Matched Subjects Design
• Bayesian Probability

WHICH METHOD TO CHOOSE?

What design you choose depends on different factors.

• What information do you want? The aims of the study.
• The nature of the phenomenon - Is it feasible to collect the data, and if so, would it be valid/reliable?
• How reliable should the information be?
• Is it ethical to conduct the study?
• The cost of the design
• Is there little or much current scientific theory and literature on the topic?

FURTHER READING

• "Research Design: Qualitative, Quantitative, and Mixed Methods Approaches" by John W. Creswell
• "Essentials of Research Design and Methodology" by Geoffrey R Marczyk