Some companies simply prefer the familiarity of paying in time increments or believe that the efforts-based approach is a better fit for a specific project.

FORBES: The Way of the Future

In October 2007, the Guardian launched the Katine project in rural northern Uganda, funded by readers, which was based on a similar approach.

FORBES: Jeff Sach's Lancet Paper on Millennium Villages: Actual Scientists Seriously Unimpressed