Face Validity is a characteristic of an instrument that is manifested by being able to look like it will measure what it intends to measure.

Face validity refers to the extent to which a test appears to measure what it is supposed to measure, based purely on subjective judgment. This characteristic is important because if a test does not seem like it adequately assesses a construct or outcome, individuals might question its relevance or credibility. Essentially, face validity is about the appearance of validity rather than the quantitative measures behind it.

In practical terms, if a questionnaire designed to assess depression includes items that people recognize as relevant to the experience of depression (such as feelings of sadness, loss of interest, etc.), it is said to have high face validity. It is an important first step in establishing the validity of an instrument, as it can affect participant engagement and the overall acceptance of the tool being used.

However, it is essential to note that a test having face validity does not necessarily mean it is valid overall; empirical testing is required to establish other forms of validity (such as construct validity and criterion validity).