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Call for Proposals and HST Primer
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Hubble Space Telescope Call for Proposals for Cycle 22 > Chapter 2: Proposal Submission Policies > 2.1 The Proposal Process: Phase I and Phase II

2.1 The Proposal Process: Phase I and Phase II
STScI manages the review of HST proposals in two phases.
In Phase I, proposers submit a scientific justification and observation summary for peer review. The review panels and the Time Allocation Committee (TAC) recommend a list of proposals to the STScI Director for preliminary approval and implementation (see Chapter 6). This Call for Proposals focuses on Phase I policies and procedures. Separate documentation is available for Phase II.
In Phase II, investigators with approved Phase I proposals must provide complete details of the observations in their proposed observing program. This allows STScI to conduct a technical feasibility review, and to schedule and obtain the actual observations. Programs are not approved fully until after submission of an acceptable Phase II program.
In addition to this, Phase II investigators may do the following:

Hubble Space Telescope Call for Proposals for Cycle 22 > Chapter 2: Proposal Submission Policies > 2.1 The Proposal Process: Phase I and Phase II

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