Välikatsed hõlmavad laia valikut eksperimentaalseid katsetusi, millest igaühel on erinev üldistusaste, seejuures mõned neist (nt ravi autentsus, osalejad, etalonid, kontekstid ja tulemused) viitavad sarnasustele välikatses osalenud objekti ja ülejäänud populatsiooni vahel.
Field experiments encompass a broad array of experimental designs, each with varying degrees of generality. Some criteria of generality (e.g. authenticity of treatments, participants, contexts, and outcome measures) refer to the contextual similarities between the subjects in the experimental sample and the rest of the population.
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