Key points are not available for this paper at this time.
Validity and reliability studies were conducted on the Face Scale, a very brief, pictorial scale of mood which uses a sequence of 20 faces and does not require reading literacy. Correlational and experimental evidence of the Face Scale's construct validity is presented, as well as its test-retest reliability. Recommendations are made for its use as a screening tool and for additional validity studies.
Lorish et al. (Tue,) studied this question.