Description
Different data collection strategies could apply. For instance, in some cases 'crowdsourcing' — getting distributed groups to contribute — may help get information from unreachable locations, while in other cases more traditional paper-based needs assessments or networks of trusted informants might be enough to understand the situation on the ground.
SOURCE LINK to the full article:
http://www.scidev.net/en/sub-suharan-africa/opinions/effective-disaster-response-needs-integrated-messaging.html