Coupling and Decouplingveryard projects > sebpc > coupling
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|Coupling is a measure of the linkages between
entities: the extent and rapidity with which changes within one entity
impact on another entity, or the requisite degree of coordination between
entities. Tight Coupling is contrasted with Loose Coupling.
One of the central concepts of service orientation (distribution and federation) is that of decoupling. Encapsulating some business function inside a component or service partially decouples this function from the rest of the business.
|Advantages of decoupling||Coordination & clustering||component-based business|
Advantages of Decouplingveryard projects > cbse > coupling & decoupling > advantages
|In some cases, a very complex set of business processes may be governed
by a relatively simple set of rules. Separating the rules from the processes
allows the rules to be properly confirmed and verified, without getting
into the complexity of the process.
For example, in food processing, the rules about the correct labelling of products apply across a wide range of different manufacturing and packaging processes.Conversely, there may be relatively simple business processes that are governed by a complex array of rules.
This is often the case in financial applications, where the same basic process is used to sell everything from car insurance to pensions, but with complicated rules attached to each product.
|Rules and procedures may be owned by different groups of managers.
For example, there may be rules adminstered by the company secretariat or by external auditors. Some commentators on the Enrol scandal have noted that accounting practice in the USA is complicated and tightly coupled to business structures and procedures, and have suggested that a more detached rules-based approach to audit might have been more successful in spotting problems earlier.
Rate of Change
|The rules may evolve on a different timescale to the business process. Externally imposed rules evolve on a legislative cycle, internally generated rules evolve with business strategy; meanwhile business processes should be adjusted to the prevailing market forces and the current state of business partnerships. Even for internally generated rules, it may make sense to freeze the rules while changing the tactical implementation of the business process, or vice versa, so that the effects of the change can be properly monitored and understood.|
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