Effective schools variables identified in several literature reviews w
ere collapsed into 6 constructs, and the independent effect of each co
nstruct was empirically tested on student achievement level, The data
for this analysis were taken from the National Educational Longitudina
l Study for the years 1988, 1990, and 1992. The regression analysis of
the data indicates that the most important effective schools characte
ristics are an achievement-oriented school culture, principal autonomy
in hiring and firing teachers, and high teacher morale. No evidence w
as found that teacher empowerment, teacher education level, most princ
ipal influences, and quality of relations between the administration a
nd the school are related to student performance.