Seeking info on writing program assessment

Our university is currently designing a program to assess several aspects of our First Year Writing program, which consists of two semesters of English Composition. We're considering several options/models for this assessment program, and I'm very interested to hear "real life" stories from WPAs about experiences they've had implementing such programs -- what have been the most significant challenges? benefits? if you could redesign your assessment program from the ground up, what might you do differently?

Ours is a mid-sized, undergrad-only branch campus of a major research university, and I'm especially interested to hear from WPAs at similar institutions, though I'm grateful for hard-won wisdom anyone might have to pass along.

Please reply on-list or (preferably) off-list to ritz@pitt.edu

Many thanks,
Jonathan Ritz
Assistant Professor of Writing
University Writing Director
University of Pittsburgh at Johnstow