We describe some of the modeling behind a simulation program that estimates the costs and benefits to a university of adopting certain family-friendly policies for faculty members. This working paper is part of the Tools for Change project, which is funded by the National Science Foundation. The co-Principal Investigators of the Tools for Change project are Mary Ann Mason, Former Dean of the Graduate Division, University of California, Berkeley,
and Distinguished Professor Joan C. Williams, 1066 Foundation Chair and Founding Director of the Center for WorkLife Law at the University of California, Hastings College of the Law. The tool described in this paper can be found (or will be hosted in the future) at the following website: http://www.toolsforchangeinstem.org/.