Sustainability of this participation after the completion of
a project cannot be ensured.
Financial, as well as operational, sustainability
are the criteria that one requires to ensure for the success
of the system. Therefore, with these constraints, such a system may
work as long as the size of operation is small and the property rights
(i.e., roles, responsibilities and incentives) are clearly defined. With
the increase in the size of the system, the role of the government, or
municipal authorities, become important.