There are several general classes of<unk> estimates: *Inter-rater<unk> assesses the degree of agreement between two or more raters in their appraisals. For example, a person gets a stomach ache and different doctors all give the same diagnosis. *Test-retest<unk> assesses the degree to which test scores are consistent from one test administration to the next. Measurements are gathered from a single rater who uses the same methods or instruments and the same testing conditions. This includes intra-rater<unk>  *Inter-method<unk> assesses the degree to which test scores are consistent when there is a variation in the methods or instruments used. This allows inter-rater<unk> to be ruled out. When dealing with forms, it may be termed parallel-forms<unk>  *Internal consistency<unk>  assesses the consistency of results across items within a test.
Reliability 
Data validation
Inter-rater reliability
Construct validity
Proportional reporting ratio
Appropriate use criteria
Relative biological effectiveness
Indicative limit value