Answer:
The reliability of measurement was dependent on the instrument used to make the measurement.
Reliability and validity are the faithful instruments to measure that much the test is reliable or consider the test for what the test is made. The main focus or researcher to reduce the error variability in the test.
The reliability considers the internal reliability test and inter-rater reliability test to measure the instrument of a test. In the health care department, there also need an instrument that can measure the level of mental illness through measurement tools that are reliable and valid.