This collection of recent work in Optimality Theory includes both syntax and phonology papers. The full table of contents, along with ordering information, may be obtained from glsa@linguist.umass.edu. Below is a list of authors whose work is included in UMOP 18. Mahasen Abu-Mansour; John Alderete; Jill Beckman; Laura Benua; Pat Deevy; Mike Dickey; Jane Grimshaw & Vieri Samek-Lodovici; David Holton; Junko Ito & Armin Mester; Greg Lamontagne & Keren Rice; Geraldine Legendre, Colin Wilson, Paul Smolensky, Kristin Homer & William Raymond; Linda Lombardi; John McCarthy & Alan Prince; Jaye Padgett; Sam Rosenthall; Lisa Selkirk; Tim Sherer; Peggy Speas; Suzanne Urbanczyk; Ellen Woolford; Jennifer Yearley.