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Reliability
Reliability refers to whether the scores are reproducible. Not all of the different types of reliability apply to the way that the CAGE is typically used. Internal consistency (whether all of the items measure the same construct) is not usually reported in studies of the CAGE; nor is inter-rater reliability (which would measure how similar peoples' responses were if the interviews were repeated again, or different raters listened to the same interview).

Explanation with references

Validity
Validity describes the evidence that an assessment tool measures what it was supposed to measure. There are many different ways of checking validity. For screening measures such as the CAGE, diagnostic accuracy and discriminative validity are probably the most useful ways of looking at validity.

Rating (adequate, good, excellent, too good*) * Table from Youngstrom et al., extending Hunsley & Mash, 2008; *indicates new construct or category