I use ER diagrams to model data structures, even if they are not stored in a database. I find them to be much clearer than class diagrams for example, and they

I use ER diagrams to model data structures, even if they are not stored in a database. I find them to be much clearer than class diagrams for example, and they help to keep an overview of everything. Otherwise, I sometimes use activity diagrams to model some complicated logic but don't use anything else of UML.