strange situation considered as reliable as if repeated with the same people, the same results are recorded
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inter rater reliability
when observations use two observers, the observational checklists show the same results
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Internal validity
describes if the investigation is measuring what its suposed to be- checks how accurate the results are
some researchers argued that it isn't a valid measure of attachment type as in some cases babies have a different classification depending who they are with, suggesting the strange situation actually measure relationship and not attachment type
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population validity
if the results can be generalised to the rest of the target population
the original study was only conducted with 26 middle class american families, so we can't be sure that we will get the same results in other cultures
also, 26 is a small sample size
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ecological validity
measures if results can be generalised to real life situations
observation carried out in a lab, very artifical envrionment creating low levels of ecological validity. wasn't what the baby was used to, meaning they could have changed their behaviour and appear more stressed and upset than if they were at home
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predictive validity
predictions made in the strange situation tend to be accurate
Type A baby will grow up to be shy
Type B baby will grow up to be popular, confident and a social leader
Type C baby will grow up to be attention seeking and moody
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