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A term from research methodology referring to the factors that can influence a study's results, specifically highlighting the gap between controlled experiments and messy reality. Internal Variables are the conditions carefully managed inside the study—the specific lighting, the homogeneous participant pool, the standardized [instructions]. External Variables are the chaotic, real-world factors that exist outside the lab—distractions, peer pressure, lack of sleep, economic stress, and [the general] unpredictability of life. A study's failure often comes from perfectly [controlling] the Internal Variables while completely ignoring the External ones that actually drive behavior in the wild.
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