![]() There are many different types of validity, including external validity which is the extent to which the results can be generalised, and internal validity which is when a study produces one single explanation for the relationship between the variables. Validity, on the other hand is the extent to which the procedure measures what it intends to measure. Now you read that you have in fact gained 2lbs (which sounds a bit more reasonable) and realise that you can’t really trust your scales, you need one that is more reliable. For example, you step on your bathroom scales and read that you have lost 5lbs since last week, you think back to the amount of Mcdonalds you stuffed yourself with that week and so step back onto the scales to double check. So, why are they so special? This week I’m going to be discussing the importance and possible flaws surrounding these two fundamental aspects of psychological research.įirstly I will define each term, since I know how easily they can be confused and mixed up! Reliability refers to the consistency of a measurement. ‘Reliability’ and ‘validity’ – two words that almost always crop up when discussing and analysing scientific research.
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