Phonetic form takes surface structure as its input, and outputs an audible (or visual, in the case of sign languages), pronounced sentence.
[1] This is part of the Y- or T-model of grammar within minimalist grammar,[2] wherein the syntactic structure is constructed and then transferred (called spell-out) to both the Phonetic Form and the Logical Form.
[3] According to some theories of prosody, the prosodic representation is derived with direct reference to the hierarchical syntactic structure.
[4] Kahnemuyipour (2009) demonstrates, using evidence from several languages, how information structure can be represented in the transfer from syntax to phonology, arguing that transfer can only be uni-directional, from syntax to phonology.
[6] The extent of the interaction between the syntax and phonology at the interface is a matter of current debate.