Five new contributions to Nature 's online debate about open peer review are published today.

Systems: An open, two-stage peer-review journal

Thomas Koop and Ulrich Pöschl

Technical solutions: Wisdom of the crowds

Chris Anderson

Quality and value: Statistics in peer review

David Ozonoff

Ethics: What is it for?

Elizabeth Wager

Perspective: The pros and cons of open peer review

Thomas DeCoursey

All articles are available at:

http://www.nature.com/nature/peerreview/debate/index.html

Readers are invited to join the debate in Nature's peer-review comments blog at:

http://blogs.nature.com/nature/peerreview/debate/comments