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An example of a noncontributory program is
Surveys
Research tools consisting of questionnaires or interviews used to gather data on opinions, experiences, or behaviors of a group of people.
Naturalistic Observations
A research method in which subjects are observed in their natural environment without any manipulation by the observer.
Experiments
Controlled procedures carried out to study the effects of variable manipulation on a particular system or subject, often used to establish causal relationships.
Case Studies
Research method involving an up-close, in-depth, and detailed examination of a particular case within a real-world context.
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