Reliability
The extent to which research findings would be the same if the study were repeated with the same methods; a measure of consistency and objectivity.
Real World
A structured questionnaire asking 'How many hours of TV do you watch per week?' will yield the same types of responses regardless of which researcher administers it, making it far easier to replicate than an unstructured interview where conversation varies each time.
Exam Focus
Don't confuse reliability with validity — explicitly state that a measure can be consistent (reliable) yet still not capture the truth (invalid).
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