it is incurred solely to support work under the sponsored agreement;
 

it benefits both the sponsored agreement and other work of the institution, in proportions that can be approximated through the use of reasonable methods;
 

it is necessary for the overall operation of the institution and is deemed assignable in part to sponsored projects.  (In other words, if the cost provides a benefit to a project equal to 50 percent of the cost, then only 50 percent should be charged to that project.)
 

any cost that is allocable to a federally sponsored agreement may not be shifted to another sponsored agreement to meet deficiencies caused by cost overruns or other funding considerations.