I am a fan of John W Willshires analogy about fireworks and bonfires. Here´s a presentation about measuring social projects.
<div style="width:425px;text-align:left" id="__ss_2689586">Bonfires, Sid Meier, Ice Cube & The Wire
</object><div style="font-size:11px;font-family:tahoma,arial;height:26px;padding-top:2px;">View more presentations from John V Willshire.</div></div>