I frequently communicate architecture with diagram that simply contains following three things: - boxes (rectangles with text in them) - arrows connecting these

I frequently communicate architecture with diagram that simply contains following three things: - boxes (rectangles with text in them) - arrows connecting these boxes - and some brief text to convey any architecture/ideas Apart from this, sometime I also use "sequence diagrams" - vertical lines representing systems/modules to illustrate the sequence of flow of any system/user action.