Concerns about the instructional validity of traditional assessment ha
ve led researchers and teachers to explore different ways to evaluate
students' performance on general literacy abilities. Valid assessment
has particular significance for children with special needs, for whom
effective instruction is so closely tied to accurate and appropriate d
iagnosis; Among the most commonly used forms of alternative assessment
are literacy portfolios. While portfolio assessment appears to be a p
romising practice. teachers, administrators, and parents have raised q
uestions about two particular aspects: (1) establishing shared standar
ds across classrooms and grades and (2) achieving agreement in judging
individual pieces of work. The purpose of this article is to describe
one framework for using portfolios in which common benchmarks and rub
rics provided explicit and shared criteria for judging both the collec
tion of work in the portfolio and individual performance samples.