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Research Design – Types of Research Design

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❶We can classify designs into a simple threefold classification by asking some key questions. Having a clear objective for a research is a reflection of how explicit the research question is.

What are the types of Research Design?

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If the researcher does not have any specific hypotheses beforehand, the study is exploratory with respect to the variables in question although it might be confirmatory for others.

The advantage of exploratory research is that it is easier to make new discoveries due to the less stringent methodological restrictions. In other words, if the researcher simply wants to see whether some measured variables could be related, he would want to increase the chances of finding a significant result by lowering the threshold of what is deemed to be significant. Sometimes, a researcher may conduct exploratory research but report it as if it had been confirmatory 'Hypothesizing After the Results are Known', HARKing—see Hypotheses suggested by the data ; this is a questionable research practice bordering on fraud.

A distinction can be made between state problems and process problems. State problems aim to answer what the state of a phenomenon is at a given time, while process problems deal with the change of phenomena over time. Examples of state problems are the level of mathematical skills of sixteen-year-old children or the level, computer skills of the elderly, the depression level of a person, etc.

Examples of process problems are the development of mathematical skills from puberty to adulthood, the change in computer skills when people get older and how depression symptoms change during therapy. State problems are easier to measure than process problems. State problems just require one measurement of the phenomena of interest, while process problems always require multiple measurements.

Research designs such as repeated measurements and longitudinal study are needed to address process problems. In an experimental design, the researcher actively tries to change the situation, circumstances, or experience of participants manipulation , which may lead to a change in behaviour or outcomes for the participants of the study.

The researcher randomly assigns participants to different conditions, measures the variables of interest and tries to control for confounding variables. Therefore, experiments are often highly fixed even before the data collection starts. In a good experimental design , a few things are of great importance. First of all, it is necessary to think of the best way to operationalize the variables that will be measured, as well as which statistical methods would be most appropriate to answer the research question.

Thus, the researcher should consider what the expectations of the study are as well as how to analyse any potential results. Finally, in an experimental design, the researcher must think of the practical limitations including the availability of participants as well as how representative the participants are to the target population. It is important to consider each of these factors before beginning the experiment. Non-experimental research designs do not involve a manipulation of the situation, circumstances or experience of the participants.

Non-experimental research designs can be broadly classified into three categories. First, in relational designs, a range of variables are measured. These designs are also called correlation studies because correlation data are most often used in the analysis.

Since correlation does not imply causation , such studies simply identify co-movements of variables. Correlational designs are helpful in identifying the relation of one variable to another, and seeing the frequency of co-occurrence in two natural groups See correlation and dependence.

The second type is comparative research. These designs compare two or more groups on one or more variable, such as the effect of gender on grades. The third type of non-experimental research is a longitudinal design. A longitudinal design examines variables such as performance exhibited by a group or groups over time. Famous case studies are for example the descriptions about the patients of Freud, who were thoroughly analysed and described. This type of research is involved with a group, organization, culture, or community.

Normally the researcher shares a lot of time with the group. Grounded theory research is a systematic research process that works to develop "a process, and action or an interaction about a substantive topic".

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Typical Experimental Designs

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Design types and sub-types. There are many ways to classify research designs, but sometimes the distinction is artificial and other times different designs are combined. Nonetheless, the list below offers a number of useful distinctions between possible research designs. A research design is an arrangement of conditions or collections.

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This type of research design draws a conclusion by comparing subjects against a control group, in cases where the researcher has no control over the experiment. There are two general types of observational designs. In direct .

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Research design is composed of methods and processes that are used to help gather data for scientific research. Due to the many different uses of research, there are many different types of research design. Basic Research Designs. Basic Research Designs. This module will introduce the basics of choosing an appropriate research design and the key factors that must be considered. Learning Objectives. Distinguish between quantitative and qualitative research methods. Types of Research Design.

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To illustrate the different types of designs, consider one of each in design notation. The first design is a posttest-only randomized experiment. You can tell it's a randomized experiment because it has an R at the beginning of each line, indicating random assignment. The second design is a pre-post nonequivalent groups quasi-experiment. The design is the structure of any scientific work. It gives direction and systematizes the research. Different types of research designs have .