Principal investigators are allowed to submit proposals that span up to 4 semesters.  The intent of allowing PIs this option is to reduce workload on both PIs and the NASA Keck TAC for long-term programs that span many semesters.  The NASA Keck TAC will be instructed to consider these proposals in light of all of the criteria that apply for single semester proposals, in addition to the following considerations:

• If the proposal were accepted for only a single semester, what is the likelihood that it would be successfully resubmitted over the ensuing semesters? 
• How much observing time does the TAC consider appropriate to remove from consideration in upcoming semesters?
• Does the PI have a demonstrated history of successful proposals?

Web Curator & MSC Cognizant Official: Dawn Gelino