Editing Consistency model (section)

==== Consistent ordering of operations ====
Some consistency models such as sequential and also causal consistency models deal with the order of operations on shared replicated data in order to provide consistency. In these models, all replicas must agree on a consistent global ordering of updates.

===== Grouping operations =====

In grouping operation, accesses to the synchronization variables are sequentially consistent. A process is allowed to access a synchronization variable that all previous writes have been completed. In other words, accesses to synchronization variables are not permitted until all operations on the synchronization variables are completely performed.<ref name="Replica"/>