The linked blog post from the Points of Light Foundation may offer a useful case study for student discussions about the need to do critical thinking when considering ways to get involved and support international efforts.
While many well intentioned people enjoy donating items to giving money, examples are given describing the additional volunteer and storage that items require compared to the usefulness of money. Posts such as these can help facilitate conversations about the need for international organizations to develop trust and communicate their needs. Link: http://www.pointsoflight.org/blog/2015/09/24/how-volunteers-are-helping-refugees-–-and-what-you-can-do
