Gerrymandering, the process of manipulating political district boundaries for some advantage, is a broadly recognized but poorly understood process. This topic was first discussed here in GIS & You by Dennis Higgins in a September 2017 article. Now, Mark Salling, Ph.D., GISP, Senior Fellow and Research Associate at the Maxine Goodman Levin College of Urban Affairs at Cleveland State University, has written an informative article for the GIS Professional, the bimonthly newsletter of the Urban and Regional Information Systems Association.