Adjunct Studies pertain during only the Main Study. An Adjunct Study application and further guidance will be posted at a later date, prior to implementation of the Main Study. For a general description of the Adjunct Study application process, see the Adjunct Studies Overview.
At this time, applications may be submitted for Supplemental Methodological Studies, pertaining to the Vanguard pilot phase. See Supplemental Methodological Studies for outside-initiated add-on studies during the Vanguard phase.