One main principle of the behaviourist approach is that it is only concerned with observable behaviour, this is why introspection was rejected by behaviourist as it could not be measured nor observed and the concepts were to vague.
Most experiments in the behaviourist approach employ highly controlled lab experiments plus scientific equipment, this means it has scientific credibillity and has more internal validity as lab experiments usually have more control over external vairables.
Behaviourists suggest that animals can replace humans as test subjects in experiments because we are seen as machine like responders.
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