Note: A group of us are working on a new report, which will become available as a book soon.  You can check our progress at our project blog. The study here is still available as is. Some of it is clearly out-of-date, some of it is still relevant. The new one is different enough that both will remain available in parallel. Thank you for visiting.

Welcome to the homepage of this 2001 report! It is a bit outdated but you are invited to download it below. It is free.

Download Please enter your information here E-mail  (required) Name (required) Organization How did you hear about this report? Would you like to be informed about new versions or related publications/events? Click on the link below to submit your information and choose your download options.