UML diagrams. I sometimes use sequence diagrams, but almost certainly with all the wrong symbols and so on. They're just parallel timelines showing communicatio

UML diagrams. I sometimes use sequence diagrams, but almost certainly with all the wrong symbols and so on. They're just parallel timelines showing communication between conceptual objects. Otherwise, all I've ever seen anyone do is take their actual design diagrams and laboriously turn them into UML diagrams of some kind for a document. The recipient then took the UML diagrams from that and made their own new sketches from that, turning them into something they could easily read and understand and that generally looked very similar to the original diagram that was laboriously translated into UML. My conclusion is that a UML diagram is better than nothing, but not as good as a well-written and well-explained design. I suspect UML diagrams are meant to be part of a well written, well-explained design, but for any given design there seems to be a better way to draw it than UML diagrams.