Share your opinions on these two kinds of evaluation on Channel-Talk.
To investigate the evaluation methods teachers have used (and researchers have investigated) throughout the past 25 years, take a look at Evaluating Student Writing: Methods and Measurement, a synopsis written by Nancy B. Hyslop for the ERIC Review.
The Center for Interdisciplinary Studies at the University of Minnesota offers a collection of thoughtful articles on responding to student writing from the perspective of teachers and peers in the writing community.