Regular research papers must not exceed 10 pages in ACM Proceedings style. Tool demonstration papers must not exceed 4 pages in ACM Proceedings style, and authors will be expected to present a live demonstration of the described tool at the workshop (tool papers should include an additional appendix of up to 6 additional pages giving the outline, screenshots, examples, etc. to indicate the content of the proposed live demo at the workshop). Authors are strongly encouraged to consult the advice for authoring research papers and tool papers before submitting. Papers should be submitted electronically via the workshop web site. The workshop proceedings will be published in the ACM Digital Library and selected papers will be invited for a journal special issue dedicated to PEPM'08.