While DARPA has been lauded for significant technological successes ex post (e.g. the internet, GPS, etc.), ARPA-E, a relatively young agency, has yet to be associated with similar outsized wins, making the challenge of intermediate evaluation more difficult.
It enables program managers to deliberately connect
“You get communities together that don’t naturally talk and you give them some latitude and some life, and you push them forward and see what comes out of it”