Empiricism - information gained through direct observation or experiment rather than beliefs.
Objectivity - scientists strive to be objective in observations and measurements e.g expectations shouldn't affect what record.
Replicability - Scientist record methods carefully so its easy to replicate
Control - vary one factor (IV) and observe effect on DV. to be fair test other conditions must be the same i.e controlled.
Theory construction - may occur at start or end of process. Construct theories to make predictions.
Induction - producing laws and theories based on what's observed and making sense of it.
Deduction - start with theory and look for evidence.
Falsification - only way to be certain e.g. black swan
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