PLone Improvement Proposal (just like Python's PEPs: Python Enhancement Proposals). These are documents written to structure and organise proposals for the improvement of Plone. Motivation, deliverables, risks and a list of people willing to do the work must be included. This document is submitted to the Framework Team, who reviews the proposal and decides if it's suitable to be included in the next Plone release or not. See http://docs.plone.org/develop/coredev/docs/plips.html more info about how to write a PLIP.