For the Impact Award category, your LOI must describe pilot test and/or preliminary research results that confirm the feasibility and acceptability of your proposed research.  If your pilot test or preliminary research results are incomplete at the time of LOI submission but expected to be complete by the deadline for full proposal submission, then you should describe this situation in your LOI along with the current status of the pilot test or preliminary research progress.  Selected applicants may be invited to submit a full proposal if the LOI scores highly on selection criteria and the pilot/preliminary results are expected to be complete before the full proposal submission deadline.