

The horizontal axis shows the elements that are involved in the interaction.Sequence Diagrams show elements as they interact over time and they are organized according to object (horizontally) and time (vertically): Object Dimension Either model generic interactions (showing all possible paths through the interaction) or specific instances of a interaction (showing just one path through the interaction).Model the interaction between objects within a collaboration that realizes an operation.Model the interaction between object instances within a collaboration that realizes a use case.Model high-level interaction between active objects in a system.
