A block of rooms has been reserved at the Hyatt Arlington (http://arlington.hyatt.com). Please make your reservations as soon as possible, but before 1/31/07. You should reserve your own room, which can be done by calling 1-800-233-1234. You will need to specify the Hyatt Arlington and mention the NSF Science of Design PI Meeting. You will also need to provide a credit card to reserve the room. . We will reimburse hotel expense for PIs or for co-PIs who are attending in place of PIs who are unable to attend. We cannot reimburse hotel expenses for co-PIs or other PI invitees. The group rate (whether reimbursed or not) is $219 for single occupancy.