Test retest reliability
the similarity in scores generated by the same measure across two testing sessions
Alternate forms reliability
the extent to which different forms of the same test generate similar scores for the smae person across two testing sessions (often used to overcome practice sessions)
Inter-rater reliability
the similarity in observations recorded by two observers
Ecological validity
the extent that results obtained in a research study will apply outside the labaratory
Hawethorne effect
refers to the distorting influence that the mere presence of researchers can have on the participants in the psychological research studies