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Reliability
The extent to which a measure is consistent.
Inter-rater reliability
The extent to which 2 or more observers produce consistent or similar recordings of the same observation / 2 researchers give the same rating of behaviours
Internal reliability
Consistency within a measure
Split-half reliability
The extent to which participants give similar responses in the first and second half of a measure
External reliability
Consistency over time
Test-retest reliability
The extent to which participants give the same score on a measure of two different occasions
Note 
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