Final answer:
Reliability and validity are measurement tools in client assessments. Reliability ensures consistency of a measure, while validity ensures accuracy in assessing what is intended to be measured.
Step-by-step explanation:
Reliability and Validity are two important considerations in client assessments as measurement tools. Reliability refers to the consistency of a measure, ensuring that the same results are produced under similar circumstances. It includes concepts like inter-rater reliability, internal consistency, and test-retest reliability. On the other hand, validity refers to the accuracy of a measure in assessing what it's supposed to measure. It includes concepts like ecological validity, construct validity, and face validity.