Convoys exist in the world any time multiple single items

must be related together in order to achieve something that

the individual item cannot accomplish by itself. This

concept generalizes into a basic design pattern. This is

convoy processing.

Convoy processing can be additionally broken out into two

separate categories as shown in the following list:

Sequential convoy - Items that are in a order, one after

another

Parallel convoy - Items that are in any order, but must all

be present before something occurs