I am in the process of building some guidelines for our expanding WebSphere environment, and would like to get others opinions on cell isolation best practice. I do not see adding every new WAS server into one cell; my thoughts are that this should be separated on security requirements (ie: Different LDAPs or OU isolation), and business departmental Application segregation. Im sure there are other isolation methodologies, but I am just curious of how others are isolating their Websphere cells.