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Experimental and non-experimental methods are not mutually exclusive and can be utilized complementarily to investigate different aspects of the same broader topic. A researcher might initially use a non-experimental design to broadly describe a variable or behavior as it naturally occurs. Subsequently, they can employ experimental designs to systematically manipulate related factors to uncover the specific causal mechanisms driving the observed variations.

Complementary Use of Experimental and Non-Experimental Research

Stanley Milgram's obedience studies effectively illustrate how researchers can use experimental and non-experimental approaches in complementary ways. Milgram began with a non-experimental, observational study where he measured a single variable—the extent to which participants obeyed instructions to shock a confederate under identical conditions. Following this descriptive phase, he subsequently conducted controlled experiments where he systematically manipulated independent variables, such as the physical distance between the experimenter and the participant, to explore the specific factors that causally affect the rate of obedience.

Example of Complementary Use of Experimental and Non-Experimental Research: Milgram's Studies

Which of the following best describes how experimental and non-experimental research methods can be used complementarily?

A psychologist who first conducts a survey to describe how frequently college students experience test anxiety in everyday academic settings, and then designs a controlled laboratory experiment to determine whether a specific relaxation technique causes a reduction in that anxiety, is applying experimental and non-experimental methods in a complementary way.

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