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Classical & Quasi-Experiment
Classical experiments seek to measure the causal effects of treatment variables on response variables through random assignment of subjects to experimental groups and through the manipulation of the treatment variables. Sometimes these experiments are referred to as "laboratory experiments" because of high degree of control over settings. They are commonly used in psychology and related disciplines and in clinical settings, law and other professions.
Studies that do not permit high levels of control are generally known as "Quasi-experiments" and are generally used in field settings such as schools and other institutions. Classical experiments create situations as close to real as possible. Quasi-experiments compensate for lack of controls through matching, placement and withdrawal of treatments, and statistical analysis.
A dropdown menu for selection of a research methods appears on the Research Methods Page of the Composer. It also appears on the Search Protocols Page and in the popup Protocol Description Window on the Edit Protocol Page.
If your study is a classical or quasi-experimental design, click on the dropdown list of research methods and click on "Classical & Quasi-Experiment.