In 1978 the Principles of Adult Learning Scale (PALS) was developed to measure the degree of practitioner support of the principles of the collaborative teaching-learning mode for teaching adults. Although the original study with a field test group of 57 produced a valid and reliable 44-item summated rating scale, the stability of the normative statistics for the instrument and the generalizability of the instrument to the multiple audiences within the adult education enterprise remained unestablished. The analysis of 778 cases in which PALS has been used indicated that the descriptive statistics for PALS are stable, that is, that 146 is an accurate mean while the standard deviation should be 20. An analysis of variance showed no significant differences among various groups tested and lent support for the generalizability of PALS. The factors produced by a factor analysis using the Statistical Package for the Social Sciences (SPSS) Factor Analysis program supported the construct validity of PALS. The stable normative statistics for PALS suggested that it is a valid instrument for use in research studies. (YLB)