purpose of a CPA-PR is to describe technologies or solutions that are proposed
as a preferred approach or solution to a particular urban objective, challenge,
or service. A CPA-PR is intended to document a particular approach or solution
with broad consensus and move it into a period of implementation where
operational experience can be gathered and documented. Whereas a CPA-PR document will describe
viable approaches or solutions to a specific topic area, a CPA-R will document
an approach or solution that has shown viability and success in practice across
a variety of cities in terms of culture, scale, climate, etc. As such, a CPA-R
must first be published as a CPA-PR.
Then, after multiple (at least two independent) implementations have
completed and a CPA-I published, the CPA-PR may be considered for advancement
to a CPA-R.