A problem of a single’s rater consistency over time is called as ....

A parallel problem that occurs in one rater’s application of a rating scale is called ....

Collecting data twice on the same subjects and instruments and having the same results is called ....

If the findings can be extrapolated (calculated) to the broader population means it has an ....

If the study has been designed in such way that the claims (outcomes) can be confidently up hold means it has an ....