Issues of concern in Phase I are nominally much fewer since less technical detail is required at this initial stage.
Most thorough and up-to-date info is in or linked from the Phase I documents such as the Call for Proposals, Phase I Roadmap, and HST Primer for each new cycle.
The main focus of this document is on preparation of accepted ACS programs for Phase II.
However, we choose to highlight a few specific topics here which are usually required to be considered by the proposer and requested in Phase I in order to use them in Phase II.
Failure to request them in Phase I requires a subsequent scientific and technical justification to the STScI Telescope Time Review Board (TTRB).
These requests may or may not be granted since scheduling and operational resources are limited and the TTRB’s intent is to follow any instructions and allocations from the TAC to the observers based on the TAC’s Phase I review unless very compelling new and significant benefits still in keeping with the science approved by the TAC can be demonstrated by the changes requested.
Additionally, any Visits of more than 6 consecutive orbits must be requested in the Special Requirements section of the Phase I proposal in order to use such in Phase II, and the effects on the science goals must be documented there in the event of an inability to schedule in that manner either for the initial observations or in the event of a failure of such observations.
For more on Phase I proposing for the new Imaging Spectropolarimetry mode, please see the "Special Calibrations" section below.
Although proposers are not required to specify information related to CTE in Phase I, it is an important topic which may touch on other Phase I considerations, so we have added a special section on CTE here below, as well.

Most common forgotten or misunderstood items are covered in this chapter:

Phase I Proposing Issues - Overview

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