Measurement and its criterion refer to the same point in time: an example would be a visual inspection of a wound for evidence of infection validated against bacteriological examination of a specimen [..]

A measurements ability to correlate or vary directly with an accepted measure of the same construct

the degree of communication between two measurements at the same time, primarily the investigation of one exam's validity by comparing its outcomes with another correlated exam at the same time.

In a concurrent study, job incumbents (i.e., current employees) are tested and their job performance is evaluated at the same time. The relation between current performance on the assessment and on th [..]

One of two possible forms of criterion-related validity. Regarding concurrent validity, the external criterion against which a new instrument of interest is being validated would be an already well established instrument or activity for the designated purpose. If indeed the measurements on the newly designed instrument correlated in a positive mann [..]

The degree to which a variable, measured at the same point in time as the variable of interest, can be predicted by a measurement instrument that has been validated previously.