Informational Clusters
An informational cluster is a set of modules used for every access to data that has a complex structure, sensitive security, or device dependence.
Major benefit is that the knowledge of the specific layout of the module is hidden from modules that do not use it.
The most common way to implement is as one routine with a separate entry point for each module in the cluster.
Informational clusters improve performance of a system that accesses information from a database.
Another use is for reporting errors.