APT: The Astronomer’s Proposal Tool is the STScI interactive graphical software interface for both Phase I and Phase II proposal preparation. It provides proposal preparation tools and several verification and error-checking phases: proposal syntax, operational feasibility, and schedulability. APT also will offer an option to prepare your Phase II program in a text format whose syntax is similar the previous STScI proposal preparation system, RPS2. Examples of proposals in this syntax are provided in
Section 6.5. You are strongly encouraged to make full use of the APT software. It is available on the World Wide Web at: