Reform in mathematics education has been stimulated and propelled by t
he publication of standards documents by the National Council of Teach
ers of Mathematics. This article examines the vision of teacher decisi
on making that is portrayed in NCTM Professional Teaching Standards: c
hoosing worthwhile mathematical tasks, orchestrating and monitoring cl
assroom discourse, creating an environment for learning, and analyzing
one's practice. The philosophical orientation and the set of commitme
nts to teaching and learning on which the standards are based include
stances on equity, curriculum, teaching, and learning. These stances a
re summarized under the following headings: inclusiveness, depth over
coverage, teaching for understanding, active engagement of students, c
urriculum investigations, applications, and connections.